<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2024 Workiva-->
<!--r:795aa764-0941-426f-b6d2-c4f57f94b504,g:1488ba9b-857e-40ba-a7bd-26f6100a9683-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.liveperson.com/role/Cover" xlink:type="simple" xlink:href="lpsn-20240630.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_bdb34bde-833a-4adc-ad52-4d50c3fa2e3c" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_DocumentInformationTable_bdb34bde-833a-4adc-ad52-4d50c3fa2e3c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_777530f3-ed34-4b28-8219-39f99c03572a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_bdb34bde-833a-4adc-ad52-4d50c3fa2e3c" xlink:to="loc_us-gaap_StatementClassOfStockAxis_777530f3-ed34-4b28-8219-39f99c03572a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_777530f3-ed34-4b28-8219-39f99c03572a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_777530f3-ed34-4b28-8219-39f99c03572a" xlink:to="loc_us-gaap_ClassOfStockDomain_777530f3-ed34-4b28-8219-39f99c03572a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_7a8edc2b-d9ab-4b3f-8e1e-ae7854dd9387" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_777530f3-ed34-4b28-8219-39f99c03572a" xlink:to="loc_us-gaap_ClassOfStockDomain_7a8edc2b-d9ab-4b3f-8e1e-ae7854dd9387" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_fbc9bdde-d0fe-4770-bb88-022b007592c8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_7a8edc2b-d9ab-4b3f-8e1e-ae7854dd9387" xlink:to="loc_us-gaap_CommonStockMember_fbc9bdde-d0fe-4770-bb88-022b007592c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RightsMember_4eafd141-63b6-43b3-a8ab-d5ced80032fa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_7a8edc2b-d9ab-4b3f-8e1e-ae7854dd9387" xlink:to="loc_us-gaap_RightsMember_4eafd141-63b6-43b3-a8ab-d5ced80032fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_28552132-e679-4089-9fc1-b9cd1a50f989" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_DocumentType_28552132-e679-4089-9fc1-b9cd1a50f989" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_5e74b943-92b5-42b6-9531-daa749bf32e0" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentQuarterlyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_DocumentQuarterlyReport_5e74b943-92b5-42b6-9531-daa749bf32e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_bd3c3a73-5e0c-4e7a-a318-0f79361a6d9c" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_DocumentPeriodEndDate_bd3c3a73-5e0c-4e7a-a318-0f79361a6d9c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_1ee1fa01-fb49-4403-8ae0-aa55709e960b" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_DocumentTransitionReport_1ee1fa01-fb49-4403-8ae0-aa55709e960b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_6ffb9d56-bd28-4c2a-bf03-a4f35a3e7026" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_EntityFileNumber_6ffb9d56-bd28-4c2a-bf03-a4f35a3e7026" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_c7456b8c-f260-4025-ae7a-25d813ce32f7" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_EntityRegistrantName_c7456b8c-f260-4025-ae7a-25d813ce32f7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_64475a45-31b1-4de1-be5c-46f41aae5549" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_EntityCentralIndexKey_64475a45-31b1-4de1-be5c-46f41aae5549" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_64c59520-8a32-474d-84ba-831d9a870d59" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_CurrentFiscalYearEndDate_64c59520-8a32-474d-84ba-831d9a870d59" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_fcc44c51-c0ff-43bd-be6e-bd5afb20c027" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_DocumentFiscalYearFocus_fcc44c51-c0ff-43bd-be6e-bd5afb20c027" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_b2c69424-0c0f-499c-b412-2c8d48c54de5" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_DocumentFiscalPeriodFocus_b2c69424-0c0f-499c-b412-2c8d48c54de5" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_de6fd35e-c2c3-479e-bcb9-4beaaafcd789" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_AmendmentFlag_de6fd35e-c2c3-479e-bcb9-4beaaafcd789" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_NoTradingSymbolFlag_2139bc7b-12ce-44c2-a567-0afa49e1b3a1" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_NoTradingSymbolFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_NoTradingSymbolFlag_2139bc7b-12ce-44c2-a567-0afa49e1b3a1" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_cc1e3f26-792e-4d65-8de7-23c41a505c5a" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_EntityIncorporationStateCountryCode_cc1e3f26-792e-4d65-8de7-23c41a505c5a" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_ff7d752a-00da-4d29-81f8-01c931fd78e2" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_EntityTaxIdentificationNumber_ff7d752a-00da-4d29-81f8-01c931fd78e2" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_32a7aeec-e1cf-460c-97f4-12a60ab2f2b9" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_EntityAddressAddressLine1_32a7aeec-e1cf-460c-97f4-12a60ab2f2b9" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_c79eab3f-2081-448e-92ab-9780562ce979" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_EntityAddressCityOrTown_c79eab3f-2081-448e-92ab-9780562ce979" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_a2f66a8a-6f82-43d7-b6a2-de939c4101f1" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_EntityAddressStateOrProvince_a2f66a8a-6f82-43d7-b6a2-de939c4101f1" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_e9cf5e98-f9e0-4538-bc69-8c40c77f3a5a" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_EntityAddressPostalZipCode_e9cf5e98-f9e0-4538-bc69-8c40c77f3a5a" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_463a3729-8a87-4e93-8cec-6032aa21e076" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_CityAreaCode_463a3729-8a87-4e93-8cec-6032aa21e076" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_f21374b7-c147-4390-95ca-8f8df4566a9d" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_LocalPhoneNumber_f21374b7-c147-4390-95ca-8f8df4566a9d" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_7a847a9f-4bab-4165-b35e-255defc400be" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_Security12bTitle_7a847a9f-4bab-4165-b35e-255defc400be" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_a299dcf0-05bc-4c25-bab5-2a0ddb4f90c9" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_TradingSymbol_a299dcf0-05bc-4c25-bab5-2a0ddb4f90c9" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_817e697f-3937-4bef-b9bd-8ede0393caac" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_SecurityExchangeName_817e697f-3937-4bef-b9bd-8ede0393caac" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_814ef9b3-4561-4950-a58f-cd779b4a3f43" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_EntityCurrentReportingStatus_814ef9b3-4561-4950-a58f-cd779b4a3f43" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_33cc796a-1cce-4c42-a945-ea8aece5379b" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_EntityInteractiveDataCurrent_33cc796a-1cce-4c42-a945-ea8aece5379b" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_e2491df4-7517-4f58-bb74-fe12ef9c0074" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_EntityFilerCategory_e2491df4-7517-4f58-bb74-fe12ef9c0074" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_0c812cca-a50d-45a8-b394-ae8f952cd9ab" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_EntitySmallBusiness_0c812cca-a50d-45a8-b394-ae8f952cd9ab" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_2e1e8cb4-ca3f-4c9d-b924-9a91dd175ebc" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_EntityEmergingGrowthCompany_2e1e8cb4-ca3f-4c9d-b924-9a91dd175ebc" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_7d70e87b-838f-4d49-a6b0-2583c399c9e4" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_EntityShellCompany_7d70e87b-838f-4d49-a6b0-2583c399c9e4" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_c2432145-ec85-4859-b166-acfab3b1d01b" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_1c46ec63-353c-4ab1-b935-a15e7f73c42d" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_c2432145-ec85-4859-b166-acfab3b1d01b" xlink:type="arc" order="29"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYunaudited" xlink:type="simple" xlink:href="lpsn-20240630.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYunaudited"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYunaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_ad20b287-868d-4f7f-b44a-f1d09d6d39ac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_b20cf579-b5fd-4f11-a86d-90a0974ef624" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_ad20b287-868d-4f7f-b44a-f1d09d6d39ac" xlink:to="loc_us-gaap_StatementTable_b20cf579-b5fd-4f11-a86d-90a0974ef624" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_1536d127-a317-4d9d-b10e-8a39c4de77f2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_b20cf579-b5fd-4f11-a86d-90a0974ef624" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_1536d127-a317-4d9d-b10e-8a39c4de77f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_1536d127-a317-4d9d-b10e-8a39c4de77f2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_1536d127-a317-4d9d-b10e-8a39c4de77f2" xlink:to="loc_us-gaap_EquityComponentDomain_1536d127-a317-4d9d-b10e-8a39c4de77f2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_56a4b167-fa6a-4969-bdfd-b12dcb61107c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_1536d127-a317-4d9d-b10e-8a39c4de77f2" xlink:to="loc_us-gaap_EquityComponentDomain_56a4b167-fa6a-4969-bdfd-b12dcb61107c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_21297a45-264a-4cae-b157-0477d8ca3a4d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_56a4b167-fa6a-4969-bdfd-b12dcb61107c" xlink:to="loc_us-gaap_CommonStockMember_21297a45-264a-4cae-b157-0477d8ca3a4d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_4e4b57e2-2551-4e38-8295-b46c3eeb86d7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_56a4b167-fa6a-4969-bdfd-b12dcb61107c" xlink:to="loc_us-gaap_TreasuryStockCommonMember_4e4b57e2-2551-4e38-8295-b46c3eeb86d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_93535119-1ff6-4b8d-8566-7399fef2d4e6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_56a4b167-fa6a-4969-bdfd-b12dcb61107c" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_93535119-1ff6-4b8d-8566-7399fef2d4e6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_fd087acd-0b34-4aab-9df8-30e4a78315e7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_56a4b167-fa6a-4969-bdfd-b12dcb61107c" xlink:to="loc_us-gaap_RetainedEarningsMember_fd087acd-0b34-4aab-9df8-30e4a78315e7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_3b5f30a8-da5a-4805-8451-02fbe9634499" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_56a4b167-fa6a-4969-bdfd-b12dcb61107c" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_3b5f30a8-da5a-4805-8451-02fbe9634499" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dafd8960-9c09-49f7-80ec-232a3ef4c304" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ad20b287-868d-4f7f-b44a-f1d09d6d39ac" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dafd8960-9c09-49f7-80ec-232a3ef4c304" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_306d7de5-bb59-4cf3-8bc6-f0c05eceb228" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dafd8960-9c09-49f7-80ec-232a3ef4c304" xlink:to="loc_us-gaap_SharesOutstanding_306d7de5-bb59-4cf3-8bc6-f0c05eceb228" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_ad1a9428-fd80-456b-aa19-12b068b839f8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dafd8960-9c09-49f7-80ec-232a3ef4c304" xlink:to="loc_us-gaap_StockholdersEquity_ad1a9428-fd80-456b-aa19-12b068b839f8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_450162ac-3fb4-49f0-940b-50a4eec2f974" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dafd8960-9c09-49f7-80ec-232a3ef4c304" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_450162ac-3fb4-49f0-940b-50a4eec2f974" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_fc91273e-fd7a-483c-a7e5-6dcbaea06ad7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dafd8960-9c09-49f7-80ec-232a3ef4c304" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_fc91273e-fd7a-483c-a7e5-6dcbaea06ad7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_0a50636e-1931-441f-b73b-b66674c2a149" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dafd8960-9c09-49f7-80ec-232a3ef4c304" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_0a50636e-1931-441f-b73b-b66674c2a149" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_094ab867-2d98-4b6b-b63c-babc06ca17e1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dafd8960-9c09-49f7-80ec-232a3ef4c304" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_094ab867-2d98-4b6b-b63c-babc06ca17e1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_d712b6e4-fb85-44b3-857c-57834988e7f9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dafd8960-9c09-49f7-80ec-232a3ef4c304" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_d712b6e4-fb85-44b3-857c-57834988e7f9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_dd5f98ff-1492-49bd-8214-3e71dc138bdf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dafd8960-9c09-49f7-80ec-232a3ef4c304" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_dd5f98ff-1492-49bd-8214-3e71dc138bdf" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_f4f30cd0-fbed-47a6-af1b-51e8c808cf82" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dafd8960-9c09-49f7-80ec-232a3ef4c304" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_f4f30cd0-fbed-47a6-af1b-51e8c808cf82" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_05db7c96-2c9a-4d5d-be3a-54981e130334" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dafd8960-9c09-49f7-80ec-232a3ef4c304" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_05db7c96-2c9a-4d5d-be3a-54981e130334" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_305a9c9a-4b38-4059-a4ee-77c4bac3da27" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dafd8960-9c09-49f7-80ec-232a3ef4c304" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_305a9c9a-4b38-4059-a4ee-77c4bac3da27" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_AdjustmentsToAdditionalPaidInCapitalDivestiture_5122dbc4-30ad-4ff0-9c3c-fe39acec7d78" xlink:href="lpsn-20240630.xsd#lpsn_AdjustmentsToAdditionalPaidInCapitalDivestiture"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dafd8960-9c09-49f7-80ec-232a3ef4c304" xlink:to="loc_lpsn_AdjustmentsToAdditionalPaidInCapitalDivestiture_5122dbc4-30ad-4ff0-9c3c-fe39acec7d78" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_9065b7d9-015e-4742-86e9-9d0555919626" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dafd8960-9c09-49f7-80ec-232a3ef4c304" xlink:to="loc_us-gaap_NetIncomeLoss_9065b7d9-015e-4742-86e9-9d0555919626" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_736c8a99-d48b-4266-a4b6-c2983e9b5d27" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dafd8960-9c09-49f7-80ec-232a3ef4c304" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_736c8a99-d48b-4266-a4b6-c2983e9b5d27" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_1eeaf5aa-1b7e-4513-9b45-7b67d991e078" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_fe78d3b5-452a-4a22-91d8-4088b19532ce" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUnaudited" xlink:type="simple" xlink:href="lpsn-20240630.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUnaudited"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_dca8b89e-4ef4-42c1-b4cd-de72bff40512" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_b3aca6c7-d901-408d-badd-58ead967e233" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_dca8b89e-4ef4-42c1-b4cd-de72bff40512" xlink:to="loc_us-gaap_StatementTable_b3aca6c7-d901-408d-badd-58ead967e233" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_b19bdd8e-629b-4d3e-9c16-916920efb563" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_b3aca6c7-d901-408d-badd-58ead967e233" xlink:to="loc_us-gaap_DebtInstrumentAxis_b19bdd8e-629b-4d3e-9c16-916920efb563" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_b19bdd8e-629b-4d3e-9c16-916920efb563_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_b19bdd8e-629b-4d3e-9c16-916920efb563" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_b19bdd8e-629b-4d3e-9c16-916920efb563_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_c0aa5618-3783-4a5e-8ef8-43296119301f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_b19bdd8e-629b-4d3e-9c16-916920efb563" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_c0aa5618-3783-4a5e-8ef8-43296119301f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesDue2024Member_957a085b-a06c-4f96-addc-2bcea931c457" xlink:href="lpsn-20240630.xsd#lpsn_ConvertibleSeniorNotesDue2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_c0aa5618-3783-4a5e-8ef8-43296119301f" xlink:to="loc_lpsn_ConvertibleSeniorNotesDue2024Member_957a085b-a06c-4f96-addc-2bcea931c457" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesDue2026Member_9f1c6d2f-684a-4cca-aed9-1d4f9846788b" xlink:href="lpsn-20240630.xsd#lpsn_ConvertibleSeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_c0aa5618-3783-4a5e-8ef8-43296119301f" xlink:to="loc_lpsn_ConvertibleSeniorNotesDue2026Member_9f1c6d2f-684a-4cca-aed9-1d4f9846788b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_14baa06a-77e7-42ad-a341-3c3e0f39e09b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dca8b89e-4ef4-42c1-b4cd-de72bff40512" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_14baa06a-77e7-42ad-a341-3c3e0f39e09b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_19312d2e-b89c-4769-981b-f4420b9d4929" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_14baa06a-77e7-42ad-a341-3c3e0f39e09b" xlink:to="loc_us-gaap_NetIncomeLoss_19312d2e-b89c-4769-981b-f4420b9d4929" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_22b1c3fa-a559-437f-96c3-79b1dc49904d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_14baa06a-77e7-42ad-a341-3c3e0f39e09b" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_22b1c3fa-a559-437f-96c3-79b1dc49904d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_635c5d31-8cd5-4631-8430-682adae092d5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_22b1c3fa-a559-437f-96c3-79b1dc49904d" xlink:to="loc_us-gaap_ShareBasedCompensation_635c5d31-8cd5-4631-8430-682adae092d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_a55b11ea-eb01-4621-b356-14ae7edee294" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_22b1c3fa-a559-437f-96c3-79b1dc49904d" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_a55b11ea-eb01-4621-b356-14ae7edee294" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_d942803d-ca62-499f-abaf-b21628cde70c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_22b1c3fa-a559-437f-96c3-79b1dc49904d" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_d942803d-ca62-499f-abaf-b21628cde70c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_AmortizationOfIntangibleAssetsAndFinanceLeases_462a7604-cb4f-4720-a7a0-8bef5ceebe80" xlink:href="lpsn-20240630.xsd#lpsn_AmortizationOfIntangibleAssetsAndFinanceLeases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_22b1c3fa-a559-437f-96c3-79b1dc49904d" xlink:to="loc_lpsn_AmortizationOfIntangibleAssetsAndFinanceLeases_462a7604-cb4f-4720-a7a0-8bef5ceebe80" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_e2b0a422-ffa9-4f2e-9290-af2aac016529" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AmortizationOfFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_22b1c3fa-a559-437f-96c3-79b1dc49904d" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_e2b0a422-ffa9-4f2e-9290-af2aac016529" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_ed52abad-caff-4581-96f6-61cc1b8bcf2a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_22b1c3fa-a559-437f-96c3-79b1dc49904d" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_ed52abad-caff-4581-96f6-61cc1b8bcf2a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill_74acf220-59e0-4b9b-9c67-58748ec8a9ef" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_22b1c3fa-a559-437f-96c3-79b1dc49904d" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill_74acf220-59e0-4b9b-9c67-58748ec8a9ef" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_6ee5e14b-8b22-4986-bb52-bcb7685dca38" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_22b1c3fa-a559-437f-96c3-79b1dc49904d" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_6ee5e14b-8b22-4986-bb52-bcb7685dca38" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_GainLossOnRepurchaseOfConvertibleNotes_5e296752-cdce-4bf5-a868-e0ba869557a6" xlink:href="lpsn-20240630.xsd#lpsn_GainLossOnRepurchaseOfConvertibleNotes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_22b1c3fa-a559-437f-96c3-79b1dc49904d" xlink:to="loc_lpsn_GainLossOnRepurchaseOfConvertibleNotes_5e296752-cdce-4bf5-a868-e0ba869557a6" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_ba0c234e-8d0e-48e0-96b5-31fc7e2f5bd6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProvisionForDoubtfulAccounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_22b1c3fa-a559-437f-96c3-79b1dc49904d" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_ba0c234e-8d0e-48e0-96b5-31fc7e2f5bd6" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_GainLossOnDivestiture_6e4d4032-700a-4925-ad6c-bd0079006ce6" xlink:href="lpsn-20240630.xsd#lpsn_GainLossOnDivestiture"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_22b1c3fa-a559-437f-96c3-79b1dc49904d" xlink:to="loc_lpsn_GainLossOnDivestiture_6e4d4032-700a-4925-ad6c-bd0079006ce6" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_38c25ba0-9cfe-42c0-863a-e1b1764c6e9c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_22b1c3fa-a559-437f-96c3-79b1dc49904d" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_38c25ba0-9cfe-42c0-863a-e1b1764c6e9c" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_EquityGainLossInJointVenture_343beb4e-a167-4031-a0e5-492300aec3c4" xlink:href="lpsn-20240630.xsd#lpsn_EquityGainLossInJointVenture"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_22b1c3fa-a559-437f-96c3-79b1dc49904d" xlink:to="loc_lpsn_EquityGainLossInJointVenture_343beb4e-a167-4031-a0e5-492300aec3c4" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_40add832-b65e-4fff-a98f-f7b9290c847d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_14baa06a-77e7-42ad-a341-3c3e0f39e09b" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_40add832-b65e-4fff-a98f-f7b9290c847d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_d6e97c89-9ee0-447b-8f0a-88c5ec3e3134" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_40add832-b65e-4fff-a98f-f7b9290c847d" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_d6e97c89-9ee0-447b-8f0a-88c5ec3e3134" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_IncreaseDecreaseInPrepaidExpenseAndOtherCurrentAssets_b7a134dc-297f-4c14-a617-cc411925c19f" xlink:href="lpsn-20240630.xsd#lpsn_IncreaseDecreaseInPrepaidExpenseAndOtherCurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_40add832-b65e-4fff-a98f-f7b9290c847d" xlink:to="loc_lpsn_IncreaseDecreaseInPrepaidExpenseAndOtherCurrentAssets_b7a134dc-297f-4c14-a617-cc411925c19f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_IncreaseDecreaseInCapitalizedContractCost_953f0c92-4487-4aac-a39d-c38a82c6c5ff" xlink:href="lpsn-20240630.xsd#lpsn_IncreaseDecreaseInCapitalizedContractCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_40add832-b65e-4fff-a98f-f7b9290c847d" xlink:to="loc_lpsn_IncreaseDecreaseInCapitalizedContractCost_953f0c92-4487-4aac-a39d-c38a82c6c5ff" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_5d5f44ef-e9b3-4cf1-9f18-9177f9cf6eab" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_40add832-b65e-4fff-a98f-f7b9290c847d" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_5d5f44ef-e9b3-4cf1-9f18-9177f9cf6eab" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_54edb52d-c9f2-4249-b7c3-d4d12ca7c4e9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_40add832-b65e-4fff-a98f-f7b9290c847d" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_54edb52d-c9f2-4249-b7c3-d4d12ca7c4e9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_5912b0f2-855b-442e-bb76-dca65e68f045" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_40add832-b65e-4fff-a98f-f7b9290c847d" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_5912b0f2-855b-442e-bb76-dca65e68f045" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_155be122-a723-4b75-9c1b-b1be6fa2f05a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_40add832-b65e-4fff-a98f-f7b9290c847d" xlink:to="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_155be122-a723-4b75-9c1b-b1be6fa2f05a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingLeaseLiability_330c8f18-ba55-4852-a650-4ca171223e82" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInOperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_40add832-b65e-4fff-a98f-f7b9290c847d" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingLeaseLiability_330c8f18-ba55-4852-a650-4ca171223e82" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_2bab6f9f-f801-4ba2-958f-3e0efeac4079" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_40add832-b65e-4fff-a98f-f7b9290c847d" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_2bab6f9f-f801-4ba2-958f-3e0efeac4079" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_b24f9dac-0ffb-4d16-b3b0-ef4a806198cc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_14baa06a-77e7-42ad-a341-3c3e0f39e09b" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_b24f9dac-0ffb-4d16-b3b0-ef4a806198cc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_809062ba-05b8-419d-8c79-390f6efee193" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dca8b89e-4ef4-42c1-b4cd-de72bff40512" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_809062ba-05b8-419d-8c79-390f6efee193" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_77d13d20-dd05-42c3-ba6e-3660a80d1b94" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_809062ba-05b8-419d-8c79-390f6efee193" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_77d13d20-dd05-42c3-ba6e-3660a80d1b94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireIntangibleAssets_610a4638-b464-4d83-9407-30fa3c90714c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsToAcquireIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_809062ba-05b8-419d-8c79-390f6efee193" xlink:to="loc_us-gaap_PaymentsToAcquireIntangibleAssets_610a4638-b464-4d83-9407-30fa3c90714c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_7f7a189e-00d2-4ed2-a28c-b1ff1280dad9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_809062ba-05b8-419d-8c79-390f6efee193" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_7f7a189e-00d2-4ed2-a28c-b1ff1280dad9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_689ecbf3-406b-4c16-8d55-daa73a640360" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_809062ba-05b8-419d-8c79-390f6efee193" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_689ecbf3-406b-4c16-8d55-daa73a640360" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_5569735b-aec4-400b-920f-a9c769197a59" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dca8b89e-4ef4-42c1-b4cd-de72bff40512" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_5569735b-aec4-400b-920f-a9c769197a59" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeasePrincipalPayments_1b0701cf-21be-44a3-91eb-2bebc4bc4863" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeasePrincipalPayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_5569735b-aec4-400b-920f-a9c769197a59" xlink:to="loc_us-gaap_FinanceLeasePrincipalPayments_1b0701cf-21be-44a3-91eb-2bebc4bc4863" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_057e666b-1bad-48ca-9560-2c19075f416f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_5569735b-aec4-400b-920f-a9c769197a59" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_057e666b-1bad-48ca-9560-2c19075f416f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_a6f70c3c-7ac7-49f8-8e94-51050f82aa87" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_5569735b-aec4-400b-920f-a9c769197a59" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_a6f70c3c-7ac7-49f8-8e94-51050f82aa87" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_47c0e0b1-6289-4134-88bd-c6a20177b698" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsOfDebtIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_5569735b-aec4-400b-920f-a9c769197a59" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_47c0e0b1-6289-4134-88bd-c6a20177b698" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfConvertiblePreferredStock_4ec7f788-f848-4a3a-a1e6-b69ac6d73670" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsForRepurchaseOfConvertiblePreferredStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_5569735b-aec4-400b-920f-a9c769197a59" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfConvertiblePreferredStock_4ec7f788-f848-4a3a-a1e6-b69ac6d73670" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_6057a4f9-75cc-4eab-b391-a1a044161527" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_5569735b-aec4-400b-920f-a9c769197a59" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_6057a4f9-75cc-4eab-b391-a1a044161527" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_bf9cbde0-2a65-4edc-8e89-1a80b4ce92cd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dca8b89e-4ef4-42c1-b4cd-de72bff40512" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_bf9cbde0-2a65-4edc-8e89-1a80b4ce92cd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_492e61b5-3d2c-4e1e-b68d-9d66463c1a0d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dca8b89e-4ef4-42c1-b4cd-de72bff40512" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_492e61b5-3d2c-4e1e-b68d-9d66463c1a0d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_3011ad47-02d4-4429-a64d-09b61887f68d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dca8b89e-4ef4-42c1-b4cd-de72bff40512" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_3011ad47-02d4-4429-a64d-09b61887f68d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_AssetsHeldForSaleCashCurrent_52436e5b-cb1c-47fd-bd98-dd0e4ad6d299" xlink:href="lpsn-20240630.xsd#lpsn_AssetsHeldForSaleCashCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dca8b89e-4ef4-42c1-b4cd-de72bff40512" xlink:to="loc_lpsn_AssetsHeldForSaleCashCurrent_52436e5b-cb1c-47fd-bd98-dd0e4ad6d299" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_bf0334c9-7fd8-45c5-af05-9e2998a23b9b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_57926f77-79a5-43b8-8904-dc283f5d9f51" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dca8b89e-4ef4-42c1-b4cd-de72bff40512" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_57926f77-79a5-43b8-8904-dc283f5d9f51" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_798c2cb8-e8d9-4d82-9703-863c9f2f3a08" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_57926f77-79a5-43b8-8904-dc283f5d9f51" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_798c2cb8-e8d9-4d82-9703-863c9f2f3a08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCash_6639dd23-3921-45c5-92da-b0827de2b304" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_57926f77-79a5-43b8-8904-dc283f5d9f51" xlink:to="loc_us-gaap_RestrictedCash_6639dd23-3921-45c5-92da-b0827de2b304" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_5d21fbf8-b4be-4a96-98bf-4bc2e5fc5242" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_639354d2-bf5b-466a-b277-a5906f8063db" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SupplementalCashFlowInformationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dca8b89e-4ef4-42c1-b4cd-de72bff40512" xlink:to="loc_us-gaap_SupplementalCashFlowInformationAbstract_639354d2-bf5b-466a-b277-a5906f8063db" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_e6471623-5893-4292-9462-d541c3c71bc8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxesPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_639354d2-bf5b-466a-b277-a5906f8063db" xlink:to="loc_us-gaap_IncomeTaxesPaidNet_e6471623-5893-4292-9462-d541c3c71bc8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidNet_071dba99-2002-4521-b20d-1589d0544b04" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_639354d2-bf5b-466a-b277-a5906f8063db" xlink:to="loc_us-gaap_InterestPaidNet_071dba99-2002-4521-b20d-1589d0544b04" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_51d92cd8-50e9-4e0d-8418-d20878045f72" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dca8b89e-4ef4-42c1-b4cd-de72bff40512" xlink:to="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_51d92cd8-50e9-4e0d-8418-d20878045f72" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_b61e320f-fdf7-41e3-8cc8-47ab3de4d8f4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalExpendituresIncurredButNotYetPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_51d92cd8-50e9-4e0d-8418-d20878045f72" xlink:to="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_b61e320f-fdf7-41e3-8cc8-47ab3de4d8f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_ff211529-5b63-42fe-9e23-d16458456722" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_51d92cd8-50e9-4e0d-8418-d20878045f72" xlink:to="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_ff211529-5b63-42fe-9e23-d16458456722" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/RevenueRecognitionDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#RevenueRecognitionDisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/RevenueRecognitionDisaggregationofRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_0e1d0fa1-b81c-4d65-a0e3-b1ac1f86db59" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_a75425f6-2258-4b9e-97bc-e55a4d26a8e3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_0e1d0fa1-b81c-4d65-a0e3-b1ac1f86db59" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_a75425f6-2258-4b9e-97bc-e55a4d26a8e3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_b93c43bf-8b88-42fc-ac4d-4f4c7004a904" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_a75425f6-2258-4b9e-97bc-e55a4d26a8e3" xlink:to="loc_srt_ProductOrServiceAxis_b93c43bf-8b88-42fc-ac4d-4f4c7004a904" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_b93c43bf-8b88-42fc-ac4d-4f4c7004a904_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_b93c43bf-8b88-42fc-ac4d-4f4c7004a904" xlink:to="loc_srt_ProductsAndServicesDomain_b93c43bf-8b88-42fc-ac4d-4f4c7004a904_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_afcbf32e-9ddc-4eca-9c3a-217bb6c02cff" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_b93c43bf-8b88-42fc-ac4d-4f4c7004a904" xlink:to="loc_srt_ProductsAndServicesDomain_afcbf32e-9ddc-4eca-9c3a-217bb6c02cff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_HostedServicesBusinessMember_5d168a75-862a-4fd9-890a-1c30226ccdf7" xlink:href="lpsn-20240630.xsd#lpsn_HostedServicesBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_afcbf32e-9ddc-4eca-9c3a-217bb6c02cff" xlink:to="loc_lpsn_HostedServicesBusinessMember_5d168a75-862a-4fd9-890a-1c30226ccdf7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ProfessionalServicesMember_27ee0918-f36d-4968-9a72-5d3f4b85fd70" xlink:href="lpsn-20240630.xsd#lpsn_ProfessionalServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_afcbf32e-9ddc-4eca-9c3a-217bb6c02cff" xlink:to="loc_lpsn_ProfessionalServicesMember_27ee0918-f36d-4968-9a72-5d3f4b85fd70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_HostedServicesConsumerMember_259f3c2a-5316-445a-88c7-912779d30878" xlink:href="lpsn-20240630.xsd#lpsn_HostedServicesConsumerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_afcbf32e-9ddc-4eca-9c3a-217bb6c02cff" xlink:to="loc_lpsn_HostedServicesConsumerMember_259f3c2a-5316-445a-88c7-912779d30878" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_ed02c828-a218-4df7-b4b5-76ec5d8f68cb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_a75425f6-2258-4b9e-97bc-e55a4d26a8e3" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_ed02c828-a218-4df7-b4b5-76ec5d8f68cb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_ed02c828-a218-4df7-b4b5-76ec5d8f68cb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_ed02c828-a218-4df7-b4b5-76ec5d8f68cb" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_ed02c828-a218-4df7-b4b5-76ec5d8f68cb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_27202c62-bfe1-43a6-9e08-9645bc6e5acf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_ed02c828-a218-4df7-b4b5-76ec5d8f68cb" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_27202c62-bfe1-43a6-9e08-9645bc6e5acf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_KasambaIncMember_2a4083b2-21b1-41b5-8233-ae44cde14f36" xlink:href="lpsn-20240630.xsd#lpsn_KasambaIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_27202c62-bfe1-43a6-9e08-9645bc6e5acf" xlink:to="loc_lpsn_KasambaIncMember_2a4083b2-21b1-41b5-8233-ae44cde14f36" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_85d407a5-63f4-43ac-ab0e-328f1131f346" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_0e1d0fa1-b81c-4d65-a0e3-b1ac1f86db59" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_85d407a5-63f4-43ac-ab0e-328f1131f346" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/RevenueRecognitionNarrativeDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#RevenueRecognitionNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/RevenueRecognitionNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b06b96b4-f9b0-467d-90c0-999245b6e214" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_7980fc75-49fb-4bdf-95e0-d22a0b3c2f26" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b06b96b4-f9b0-467d-90c0-999245b6e214" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_7980fc75-49fb-4bdf-95e0-d22a0b3c2f26" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_c397ba1f-80d9-4e1b-86dc-90bb651dade6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_7980fc75-49fb-4bdf-95e0-d22a0b3c2f26" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_c397ba1f-80d9-4e1b-86dc-90bb651dade6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_af6cf9ee-7941-40a5-973f-05e326dc6a3d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b06b96b4-f9b0-467d-90c0-999245b6e214" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_af6cf9ee-7941-40a5-973f-05e326dc6a3d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_710588c3-8882-47ac-aebb-7ec60e5f1716" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b06b96b4-f9b0-467d-90c0-999245b6e214" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_710588c3-8882-47ac-aebb-7ec60e5f1716" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_6a7f5593-7391-4a84-b10f-f28da7ba13fa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b06b96b4-f9b0-467d-90c0-999245b6e214" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_6a7f5593-7391-4a84-b10f-f28da7ba13fa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_b409574d-773f-49ee-97aa-33ed57e76aba" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b06b96b4-f9b0-467d-90c0-999245b6e214" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_b409574d-773f-49ee-97aa-33ed57e76aba" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfAcquisitionCosts_49f28e66-d1dd-477e-88ff-b43771029f7a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AmortizationOfAcquisitionCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b06b96b4-f9b0-467d-90c0-999245b6e214" xlink:to="loc_us-gaap_AmortizationOfAcquisitionCosts_49f28e66-d1dd-477e-88ff-b43771029f7a" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/RevenueRecognitionNarrativeDetails_1" xlink:type="simple" xlink:href="lpsn-20240630.xsd#RevenueRecognitionNarrativeDetails_1"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/RevenueRecognitionNarrativeDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b06b96b4-f9b0-467d-90c0-999245b6e214" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_7980fc75-49fb-4bdf-95e0-d22a0b3c2f26" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b06b96b4-f9b0-467d-90c0-999245b6e214" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_7980fc75-49fb-4bdf-95e0-d22a0b3c2f26" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_af6cf9ee-7941-40a5-973f-05e326dc6a3d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b06b96b4-f9b0-467d-90c0-999245b6e214" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_af6cf9ee-7941-40a5-973f-05e326dc6a3d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_710588c3-8882-47ac-aebb-7ec60e5f1716" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b06b96b4-f9b0-467d-90c0-999245b6e214" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_710588c3-8882-47ac-aebb-7ec60e5f1716" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_6a7f5593-7391-4a84-b10f-f28da7ba13fa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b06b96b4-f9b0-467d-90c0-999245b6e214" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_6a7f5593-7391-4a84-b10f-f28da7ba13fa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_b409574d-773f-49ee-97aa-33ed57e76aba" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b06b96b4-f9b0-467d-90c0-999245b6e214" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_b409574d-773f-49ee-97aa-33ed57e76aba" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfAcquisitionCosts_49f28e66-d1dd-477e-88ff-b43771029f7a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AmortizationOfAcquisitionCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b06b96b4-f9b0-467d-90c0-999245b6e214" xlink:to="loc_us-gaap_AmortizationOfAcquisitionCosts_49f28e66-d1dd-477e-88ff-b43771029f7a" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/RevenueRecognitionRevenuebyGeographicLocationDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#RevenueRecognitionRevenuebyGeographicLocationDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/RevenueRecognitionRevenuebyGeographicLocationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_3e910644-0559-410d-b6dc-d6bb935132f3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_4690a095-14f4-4412-8be9-d7b555c8df1a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_3e910644-0559-410d-b6dc-d6bb935132f3" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_4690a095-14f4-4412-8be9-d7b555c8df1a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_02a91170-6a87-42c0-96b6-e432d9571ffe" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_4690a095-14f4-4412-8be9-d7b555c8df1a" xlink:to="loc_srt_StatementGeographicalAxis_02a91170-6a87-42c0-96b6-e432d9571ffe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_02a91170-6a87-42c0-96b6-e432d9571ffe_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_02a91170-6a87-42c0-96b6-e432d9571ffe" xlink:to="loc_srt_SegmentGeographicalDomain_02a91170-6a87-42c0-96b6-e432d9571ffe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_1020a4a1-0c1d-4f76-b5da-892dca602bd1" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_02a91170-6a87-42c0-96b6-e432d9571ffe" xlink:to="loc_srt_SegmentGeographicalDomain_1020a4a1-0c1d-4f76-b5da-892dca602bd1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AmericasMember_36507eab-10d4-446f-a294-a04ed294c8cf" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_AmericasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_1020a4a1-0c1d-4f76-b5da-892dca602bd1" xlink:to="loc_srt_AmericasMember_36507eab-10d4-446f-a294-a04ed294c8cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_5a3f5952-7580-4435-ba41-e8e748232b3b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EMEAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_1020a4a1-0c1d-4f76-b5da-892dca602bd1" xlink:to="loc_us-gaap_EMEAMember_5a3f5952-7580-4435-ba41-e8e748232b3b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_exch_XPST_be353e14-875e-4b94-b8b7-5a1d0ec990b1" xlink:href="https://xbrl.sec.gov/exch/2023/exch-2023.xsd#exch_XPST"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_1020a4a1-0c1d-4f76-b5da-892dca602bd1" xlink:to="loc_exch_XPST_be353e14-875e-4b94-b8b7-5a1d0ec990b1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_c39ca830-aaaa-4fbd-8ad2-92e3fda8d692" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_3e910644-0559-410d-b6dc-d6bb935132f3" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_c39ca830-aaaa-4fbd-8ad2-92e3fda8d692" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/RevenueRecognitionReceivablesandDeferredRevenueDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#RevenueRecognitionReceivablesandDeferredRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/RevenueRecognitionReceivablesandDeferredRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_deb79a68-74d6-4def-b3df-2652948850be" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_6b70d9f1-0ee8-4457-84b2-f9c4476e721b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_deb79a68-74d6-4def-b3df-2652948850be" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_6b70d9f1-0ee8-4457-84b2-f9c4476e721b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis_f09cc908-ceb7-4d5a-8840-d08a495d6eac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_6b70d9f1-0ee8-4457-84b2-f9c4476e721b" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis_f09cc908-ceb7-4d5a-8840-d08a495d6eac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesBillingStatusDomain_f09cc908-ceb7-4d5a-8840-d08a495d6eac_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReceivablesBillingStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis_f09cc908-ceb7-4d5a-8840-d08a495d6eac" xlink:to="loc_us-gaap_ReceivablesBillingStatusDomain_f09cc908-ceb7-4d5a-8840-d08a495d6eac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesBillingStatusDomain_47cdba21-f162-4ba9-92ca-fb200e2771e7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReceivablesBillingStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis_f09cc908-ceb7-4d5a-8840-d08a495d6eac" xlink:to="loc_us-gaap_ReceivablesBillingStatusDomain_47cdba21-f162-4ba9-92ca-fb200e2771e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BilledRevenuesMember_c1fad4d5-6e96-4f8f-968c-2a458a6aa4c6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BilledRevenuesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivablesBillingStatusDomain_47cdba21-f162-4ba9-92ca-fb200e2771e7" xlink:to="loc_us-gaap_BilledRevenuesMember_c1fad4d5-6e96-4f8f-968c-2a458a6aa4c6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnbilledRevenuesMember_3799b571-39f7-49c9-a1d3-b0f6cabe179b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnbilledRevenuesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivablesBillingStatusDomain_47cdba21-f162-4ba9-92ca-fb200e2771e7" xlink:to="loc_us-gaap_UnbilledRevenuesMember_3799b571-39f7-49c9-a1d3-b0f6cabe179b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ContractBalancesRollForward_28b2a935-7cc9-4097-9ac9-efa7ff028c55" xlink:href="lpsn-20240630.xsd#lpsn_ContractBalancesRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_deb79a68-74d6-4def-b3df-2652948850be" xlink:to="loc_lpsn_ContractBalancesRollForward_28b2a935-7cc9-4097-9ac9-efa7ff028c55" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_cfd96bf2-dc00-44a3-a1eb-edf3ad69c7e4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_ContractBalancesRollForward_28b2a935-7cc9-4097-9ac9-efa7ff028c55" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_cfd96bf2-dc00-44a3-a1eb-edf3ad69c7e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_AccountsReceivablePeriodIncreaseDecreaseNet_e36fa03c-cb33-484f-bfdd-e1f8ecdd472c" xlink:href="lpsn-20240630.xsd#lpsn_AccountsReceivablePeriodIncreaseDecreaseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_ContractBalancesRollForward_28b2a935-7cc9-4097-9ac9-efa7ff028c55" xlink:to="loc_lpsn_AccountsReceivablePeriodIncreaseDecreaseNet_e36fa03c-cb33-484f-bfdd-e1f8ecdd472c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_f3fe3992-5bde-41a6-a8b7-91ace507c330" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNetNoncurrent_294691c8-34d8-4270-99e4-0bb70129535c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostNetNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_ContractBalancesRollForward_28b2a935-7cc9-4097-9ac9-efa7ff028c55" xlink:to="loc_us-gaap_CapitalizedContractCostNetNoncurrent_294691c8-34d8-4270-99e4-0bb70129535c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_CapitalizedContractCostsPeriodIncreaseDecreaseNet_3a2e7d1d-e382-42d8-aeeb-0186b4a00a27" xlink:href="lpsn-20240630.xsd#lpsn_CapitalizedContractCostsPeriodIncreaseDecreaseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_ContractBalancesRollForward_28b2a935-7cc9-4097-9ac9-efa7ff028c55" xlink:to="loc_lpsn_CapitalizedContractCostsPeriodIncreaseDecreaseNet_3a2e7d1d-e382-42d8-aeeb-0186b4a00a27" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNetNoncurrent_8f66d7f1-decc-4746-85ed-733f140e1654" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostNetNoncurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_59844780-6504-4b5f-9b89-c7110e76f41c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_ContractBalancesRollForward_28b2a935-7cc9-4097-9ac9-efa7ff028c55" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_59844780-6504-4b5f-9b89-c7110e76f41c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ContractWithCustomerLiabilityCurrentPeriodIncreaseDecreaseNet_d7662bbe-be50-4728-aa86-aa70a9cf96c6" xlink:href="lpsn-20240630.xsd#lpsn_ContractWithCustomerLiabilityCurrentPeriodIncreaseDecreaseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_ContractBalancesRollForward_28b2a935-7cc9-4097-9ac9-efa7ff028c55" xlink:to="loc_lpsn_ContractWithCustomerLiabilityCurrentPeriodIncreaseDecreaseNet_d7662bbe-be50-4728-aa86-aa70a9cf96c6" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_b5f73eb4-30c4-4f41-a767-05652edd35b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_393e212d-5ca7-4223-9c9c-6c9a80927ade" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_ContractBalancesRollForward_28b2a935-7cc9-4097-9ac9-efa7ff028c55" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_393e212d-5ca7-4223-9c9c-6c9a80927ade" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ContractWithCustomerLiabilityNoncurrentPeriodIncreaseDecreaseNet_f57d02be-91b2-4f09-b708-87e1a5ea5ab0" xlink:href="lpsn-20240630.xsd#lpsn_ContractWithCustomerLiabilityNoncurrentPeriodIncreaseDecreaseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_ContractBalancesRollForward_28b2a935-7cc9-4097-9ac9-efa7ff028c55" xlink:to="loc_lpsn_ContractWithCustomerLiabilityNoncurrentPeriodIncreaseDecreaseNet_f57d02be-91b2-4f09-b708-87e1a5ea5ab0" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_08c6213a-849a-4a8f-a747-a702e61c5b0d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/NetIncomeLossPerShareNarrativeDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#NetIncomeLossPerShareNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/NetIncomeLossPerShareNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_2f778485-2c33-4b66-b6a4-c95bda0d006a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_9c20526a-88cd-4e8f-ba80-8a6d798951e5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2f778485-2c33-4b66-b6a4-c95bda0d006a" xlink:to="loc_us-gaap_DebtInstrumentTable_9c20526a-88cd-4e8f-ba80-8a6d798951e5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_622b12a1-414b-4466-8b46-685320fbea60" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9c20526a-88cd-4e8f-ba80-8a6d798951e5" xlink:to="loc_us-gaap_DebtInstrumentAxis_622b12a1-414b-4466-8b46-685320fbea60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_622b12a1-414b-4466-8b46-685320fbea60_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_622b12a1-414b-4466-8b46-685320fbea60" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_622b12a1-414b-4466-8b46-685320fbea60_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_c626dca6-d400-4d11-885c-5adffdaed5a9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_622b12a1-414b-4466-8b46-685320fbea60" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_c626dca6-d400-4d11-885c-5adffdaed5a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesDue2024Member_86a23c08-1e16-44bd-ba61-335dbfb4d648" xlink:href="lpsn-20240630.xsd#lpsn_ConvertibleSeniorNotesDue2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_c626dca6-d400-4d11-885c-5adffdaed5a9" xlink:to="loc_lpsn_ConvertibleSeniorNotesDue2024Member_86a23c08-1e16-44bd-ba61-335dbfb4d648" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesDue2026Member_651fdf02-e2be-4629-bc2e-5f0d9a75627a" xlink:href="lpsn-20240630.xsd#lpsn_ConvertibleSeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_c626dca6-d400-4d11-885c-5adffdaed5a9" xlink:to="loc_lpsn_ConvertibleSeniorNotesDue2026Member_651fdf02-e2be-4629-bc2e-5f0d9a75627a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_e2bf4102-5aa6-428c-b987-edf7001fbf82" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9c20526a-88cd-4e8f-ba80-8a6d798951e5" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_e2bf4102-5aa6-428c-b987-edf7001fbf82" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_e2bf4102-5aa6-428c-b987-edf7001fbf82_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_e2bf4102-5aa6-428c-b987-edf7001fbf82" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_e2bf4102-5aa6-428c-b987-edf7001fbf82_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_153f501a-6a72-4753-96f0-b3ed5ee354cb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_e2bf4102-5aa6-428c-b987-edf7001fbf82" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_153f501a-6a72-4753-96f0-b3ed5ee354cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_27aa0c12-e27f-47ef-9b38-74bdbbe76595" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_153f501a-6a72-4753-96f0-b3ed5ee354cb" xlink:to="loc_us-gaap_ConvertibleDebtMember_27aa0c12-e27f-47ef-9b38-74bdbbe76595" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_e097191b-051e-4744-b96f-2432ada8a0ea" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9c20526a-88cd-4e8f-ba80-8a6d798951e5" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_e097191b-051e-4744-b96f-2432ada8a0ea" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_e097191b-051e-4744-b96f-2432ada8a0ea_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_e097191b-051e-4744-b96f-2432ada8a0ea" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_e097191b-051e-4744-b96f-2432ada8a0ea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_bd9ec957-78b3-4cf2-8256-ce7194211986" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_e097191b-051e-4744-b96f-2432ada8a0ea" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_bd9ec957-78b3-4cf2-8256-ce7194211986" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_SharesSubjectToOutstandingCommonStockOptionsAndEmployeeStockPurchasePlanMember_e90ffb13-ccd7-4704-8c15-a9f46c9cba94" xlink:href="lpsn-20240630.xsd#lpsn_SharesSubjectToOutstandingCommonStockOptionsAndEmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_bd9ec957-78b3-4cf2-8256-ce7194211986" xlink:to="loc_lpsn_SharesSubjectToOutstandingCommonStockOptionsAndEmployeeStockPurchasePlanMember_e90ffb13-ccd7-4704-8c15-a9f46c9cba94" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_2d620d16-fe58-478b-bed7-f348d59765f8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_bd9ec957-78b3-4cf2-8256-ce7194211986" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_2d620d16-fe58-478b-bed7-f348d59765f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_c5d11f8b-c1cc-45de-a4b3-e0ae87b89956" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2f778485-2c33-4b66-b6a4-c95bda0d006a" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_c5d11f8b-c1cc-45de-a4b3-e0ae87b89956" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_40c53bc6-a4e3-49cb-8b6f-76658f862ab6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2f778485-2c33-4b66-b6a4-c95bda0d006a" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_40c53bc6-a4e3-49cb-8b6f-76658f862ab6" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/NetIncomeLossPerShareReconciliationofSharesUsedinCalculatingBasicandDilutedEarningsPerShareDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#NetIncomeLossPerShareReconciliationofSharesUsedinCalculatingBasicandDilutedEarningsPerShareDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/NetIncomeLossPerShareReconciliationofSharesUsedinCalculatingBasicandDilutedEarningsPerShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicLineItems_bd8e3f04-801d-4630-a0f7-3bc0d8b03fe0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EarningsPerShareBasicLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_d24394fa-fdf7-402c-82a7-d4727cf241c9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_bd8e3f04-801d-4630-a0f7-3bc0d8b03fe0" xlink:to="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_d24394fa-fdf7-402c-82a7-d4727cf241c9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_c92dc966-0374-464f-a7cb-e1816f9e0207" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_d24394fa-fdf7-402c-82a7-d4727cf241c9" xlink:to="loc_us-gaap_AwardTypeAxis_c92dc966-0374-464f-a7cb-e1816f9e0207" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c92dc966-0374-464f-a7cb-e1816f9e0207_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_c92dc966-0374-464f-a7cb-e1816f9e0207" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c92dc966-0374-464f-a7cb-e1816f9e0207_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bcf3be57-0adb-42e5-a283-dc0b25e8c9e1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_c92dc966-0374-464f-a7cb-e1816f9e0207" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bcf3be57-0adb-42e5-a283-dc0b25e8c9e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_220c82a2-0d86-48c4-9ca6-5b8dff630356" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bcf3be57-0adb-42e5-a283-dc0b25e8c9e1" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_220c82a2-0d86-48c4-9ca6-5b8dff630356" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_7496ca58-7790-42d2-81f5-8f5915a5f30a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bcf3be57-0adb-42e5-a283-dc0b25e8c9e1" xlink:to="loc_us-gaap_EmployeeStockOptionMember_7496ca58-7790-42d2-81f5-8f5915a5f30a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_11aa5bf2-cb29-41af-b5a7-45c051647fa4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_d24394fa-fdf7-402c-82a7-d4727cf241c9" xlink:to="loc_us-gaap_DebtInstrumentAxis_11aa5bf2-cb29-41af-b5a7-45c051647fa4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_11aa5bf2-cb29-41af-b5a7-45c051647fa4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_11aa5bf2-cb29-41af-b5a7-45c051647fa4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_11aa5bf2-cb29-41af-b5a7-45c051647fa4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_f3d1e96b-92b4-4bf8-b8fb-490baafe8d1c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_11aa5bf2-cb29-41af-b5a7-45c051647fa4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_f3d1e96b-92b4-4bf8-b8fb-490baafe8d1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesDue2024Member_fab784b5-8f77-4a1f-902f-f94073cc26ed" xlink:href="lpsn-20240630.xsd#lpsn_ConvertibleSeniorNotesDue2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_f3d1e96b-92b4-4bf8-b8fb-490baafe8d1c" xlink:to="loc_lpsn_ConvertibleSeniorNotesDue2024Member_fab784b5-8f77-4a1f-902f-f94073cc26ed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesDue2026Member_4807acc3-42f2-483d-a612-1fcbb21301be" xlink:href="lpsn-20240630.xsd#lpsn_ConvertibleSeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_f3d1e96b-92b4-4bf8-b8fb-490baafe8d1c" xlink:to="loc_lpsn_ConvertibleSeniorNotesDue2026Member_4807acc3-42f2-483d-a612-1fcbb21301be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_19e6df48-875b-4c70-acf7-2483d5a93fa6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_bd8e3f04-801d-4630-a0f7-3bc0d8b03fe0" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_19e6df48-875b-4c70-acf7-2483d5a93fa6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DilutiveSecuritiesGainLossOnExtinguishmentOfDebt_522a4a38-5bbe-4dbb-8a6c-45d0c7f770f9" xlink:href="lpsn-20240630.xsd#lpsn_DilutiveSecuritiesGainLossOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_bd8e3f04-801d-4630-a0f7-3bc0d8b03fe0" xlink:to="loc_lpsn_DilutiveSecuritiesGainLossOnExtinguishmentOfDebt_522a4a38-5bbe-4dbb-8a6c-45d0c7f770f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther_6441ef7f-0a61-43cd-963c-49ab05c15637" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_bd8e3f04-801d-4630-a0f7-3bc0d8b03fe0" xlink:to="loc_us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther_6441ef7f-0a61-43cd-963c-49ab05c15637" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_a6cfd47a-6b7f-4e76-aef6-da4ed14afca3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_bd8e3f04-801d-4630-a0f7-3bc0d8b03fe0" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_a6cfd47a-6b7f-4e76-aef6-da4ed14afca3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_fa544abe-bf31-42d2-a475-ff478d60f209" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_bd8e3f04-801d-4630-a0f7-3bc0d8b03fe0" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_fa544abe-bf31-42d2-a475-ff478d60f209" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_e13479b3-2b8d-4e71-bf9c-85c50ef5ea20" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_bd8e3f04-801d-4630-a0f7-3bc0d8b03fe0" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_e13479b3-2b8d-4e71-bf9c-85c50ef5ea20" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares_416a4563-111b-463a-868c-ff014d083863" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_bd8e3f04-801d-4630-a0f7-3bc0d8b03fe0" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares_416a4563-111b-463a-868c-ff014d083863" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities_4585873a-0357-49b2-969e-23e970eb367b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_bd8e3f04-801d-4630-a0f7-3bc0d8b03fe0" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities_4585873a-0357-49b2-969e-23e970eb367b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_58fbc0a3-99b9-4335-9ce2-3ca655aaa1af" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_bd8e3f04-801d-4630-a0f7-3bc0d8b03fe0" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_58fbc0a3-99b9-4335-9ce2-3ca655aaa1af" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_871a5fc5-7ce2-48a5-a37c-ff927d1fb1fd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_bd8e3f04-801d-4630-a0f7-3bc0d8b03fe0" xlink:to="loc_us-gaap_EarningsPerShareBasic_871a5fc5-7ce2-48a5-a37c-ff927d1fb1fd" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_ad7b09c0-086b-411a-9c22-98e6617ebf83" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_bd8e3f04-801d-4630-a0f7-3bc0d8b03fe0" xlink:to="loc_us-gaap_EarningsPerShareDiluted_ad7b09c0-086b-411a-9c22-98e6617ebf83" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/NetIncomeLossPerShareScheduleofAntidilutiveSecuritiesExcludedfromComputationofEPSDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#NetIncomeLossPerShareScheduleofAntidilutiveSecuritiesExcludedfromComputationofEPSDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/NetIncomeLossPerShareScheduleofAntidilutiveSecuritiesExcludedfromComputationofEPSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_beaec47d-d5cc-4085-b897-9b19d9b7533f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_493d9a83-37f4-4b32-baef-f7ab71ada086" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_beaec47d-d5cc-4085-b897-9b19d9b7533f" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_493d9a83-37f4-4b32-baef-f7ab71ada086" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_fb872a62-96bd-46e8-ac78-47551e91c7e0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_493d9a83-37f4-4b32-baef-f7ab71ada086" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_fb872a62-96bd-46e8-ac78-47551e91c7e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_fb872a62-96bd-46e8-ac78-47551e91c7e0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_fb872a62-96bd-46e8-ac78-47551e91c7e0" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_fb872a62-96bd-46e8-ac78-47551e91c7e0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_b67518f0-66f7-4941-ac79-b838b11214a5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_fb872a62-96bd-46e8-ac78-47551e91c7e0" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_b67518f0-66f7-4941-ac79-b838b11214a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_SharesSubjectToOutstandingCommonStockOptionsAndEmployeeStockPurchasePlanMember_fc565a69-d70d-43e0-b65a-7a8bf7dd39c9" xlink:href="lpsn-20240630.xsd#lpsn_SharesSubjectToOutstandingCommonStockOptionsAndEmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_b67518f0-66f7-4941-ac79-b838b11214a5" xlink:to="loc_lpsn_SharesSubjectToOutstandingCommonStockOptionsAndEmployeeStockPurchasePlanMember_fc565a69-d70d-43e0-b65a-7a8bf7dd39c9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_0a71a5ff-ff27-4225-9327-f569c38a1285" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_b67518f0-66f7-4941-ac79-b838b11214a5" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_0a71a5ff-ff27-4225-9327-f569c38a1285" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_FairValueEarnoutMember_226578c4-3061-448e-b658-a0e71d084984" xlink:href="lpsn-20240630.xsd#lpsn_FairValueEarnoutMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_b67518f0-66f7-4941-ac79-b838b11214a5" xlink:to="loc_lpsn_FairValueEarnoutMember_226578c4-3061-448e-b658-a0e71d084984" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtSecuritiesMember_64f82604-61e4-4bd0-bead-488a68397051" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_b67518f0-66f7-4941-ac79-b838b11214a5" xlink:to="loc_us-gaap_ConvertibleDebtSecuritiesMember_64f82604-61e4-4bd0-bead-488a68397051" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember_e0712419-da1c-491a-9929-b6b1a9f312ff" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WarrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_b67518f0-66f7-4941-ac79-b838b11214a5" xlink:to="loc_us-gaap_WarrantMember_e0712419-da1c-491a-9929-b6b1a9f312ff" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_f49894ac-007c-4c1f-bf23-d13a3e64798b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_493d9a83-37f4-4b32-baef-f7ab71ada086" xlink:to="loc_us-gaap_DebtInstrumentAxis_f49894ac-007c-4c1f-bf23-d13a3e64798b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_f49894ac-007c-4c1f-bf23-d13a3e64798b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_f49894ac-007c-4c1f-bf23-d13a3e64798b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_f49894ac-007c-4c1f-bf23-d13a3e64798b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_7de8d1b9-b444-46cd-a025-778b48229cf5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_f49894ac-007c-4c1f-bf23-d13a3e64798b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_7de8d1b9-b444-46cd-a025-778b48229cf5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesDue2024Member_94561340-98a7-4fed-b17b-c289bfa7e57f" xlink:href="lpsn-20240630.xsd#lpsn_ConvertibleSeniorNotesDue2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_7de8d1b9-b444-46cd-a025-778b48229cf5" xlink:to="loc_lpsn_ConvertibleSeniorNotesDue2024Member_94561340-98a7-4fed-b17b-c289bfa7e57f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesDue2026Member_0fc25381-45d2-4cae-a498-d469bdd40f9f" xlink:href="lpsn-20240630.xsd#lpsn_ConvertibleSeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_7de8d1b9-b444-46cd-a025-778b48229cf5" xlink:to="loc_lpsn_ConvertibleSeniorNotesDue2026Member_0fc25381-45d2-4cae-a498-d469bdd40f9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_50d8d0b6-1f00-42e5-8776-b8bf3ff64234" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_beaec47d-d5cc-4085-b897-9b19d9b7533f" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_50d8d0b6-1f00-42e5-8776-b8bf3ff64234" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/SegmentInformationLongLivedAssetsbyGeographicRegionDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#SegmentInformationLongLivedAssetsbyGeographicRegionDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/SegmentInformationLongLivedAssetsbyGeographicRegionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_bfd3e4a3-a41b-48d5-852a-398c7e621fce" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_02e1849f-528e-4cbf-a4cf-73db859c17ea" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_bfd3e4a3-a41b-48d5-852a-398c7e621fce" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_02e1849f-528e-4cbf-a4cf-73db859c17ea" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_834b250e-9ef7-48c8-8d53-d742b9136bc8" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_02e1849f-528e-4cbf-a4cf-73db859c17ea" xlink:to="loc_srt_StatementGeographicalAxis_834b250e-9ef7-48c8-8d53-d742b9136bc8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_834b250e-9ef7-48c8-8d53-d742b9136bc8_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_834b250e-9ef7-48c8-8d53-d742b9136bc8" xlink:to="loc_srt_SegmentGeographicalDomain_834b250e-9ef7-48c8-8d53-d742b9136bc8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_8ad598c8-38b0-4b26-bf6c-280238696e7d" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_834b250e-9ef7-48c8-8d53-d742b9136bc8" xlink:to="loc_srt_SegmentGeographicalDomain_8ad598c8-38b0-4b26-bf6c-280238696e7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_c71bce0d-354b-43c9-8128-140daa2e8e04" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8ad598c8-38b0-4b26-bf6c-280238696e7d" xlink:to="loc_country_US_c71bce0d-354b-43c9-8128-140daa2e8e04" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_DE_fa7405e3-58bd-4bfe-9ceb-a689aa651fdc" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_DE"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8ad598c8-38b0-4b26-bf6c-280238696e7d" xlink:to="loc_country_DE_fa7405e3-58bd-4bfe-9ceb-a689aa651fdc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_AU_b456efba-d795-4e33-88b3-6d6f81fb7784" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_AU"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8ad598c8-38b0-4b26-bf6c-280238696e7d" xlink:to="loc_country_AU_b456efba-d795-4e33-88b3-6d6f81fb7784" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_NL_00db1b79-7c2b-44bd-ae0a-14343e329c76" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_NL"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8ad598c8-38b0-4b26-bf6c-280238696e7d" xlink:to="loc_country_NL_00db1b79-7c2b-44bd-ae0a-14343e329c76" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_UnitedKingdomGermanyJapanFranceItalyMember_08ea5440-6eab-4afe-b762-ae9687e85662" xlink:href="lpsn-20240630.xsd#lpsn_UnitedKingdomGermanyJapanFranceItalyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8ad598c8-38b0-4b26-bf6c-280238696e7d" xlink:to="loc_lpsn_UnitedKingdomGermanyJapanFranceItalyMember_08ea5440-6eab-4afe-b762-ae9687e85662" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncurrentAssets_ec1d7b3d-59c1-44db-b0ac-8a473b0b48ac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_bfd3e4a3-a41b-48d5-852a-398c7e621fce" xlink:to="loc_us-gaap_NoncurrentAssets_ec1d7b3d-59c1-44db-b0ac-8a473b0b48ac" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/GoodwillandIntangibleAssetsChangesinCarryingAmountofGoodwillDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#GoodwillandIntangibleAssetsChangesinCarryingAmountofGoodwillDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/GoodwillandIntangibleAssetsChangesinCarryingAmountofGoodwillDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_9c1abb55-0d8a-4c59-8a1b-ee6bab655153" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_17bd821d-d693-486f-b598-205aa41e47b4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_9c1abb55-0d8a-4c59-8a1b-ee6bab655153" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_17bd821d-d693-486f-b598-205aa41e47b4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_efba242a-445d-4fef-ad37-8e8258d2f47e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_17bd821d-d693-486f-b598-205aa41e47b4" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_efba242a-445d-4fef-ad37-8e8258d2f47e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_efba242a-445d-4fef-ad37-8e8258d2f47e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_efba242a-445d-4fef-ad37-8e8258d2f47e" xlink:to="loc_us-gaap_SegmentDomain_efba242a-445d-4fef-ad37-8e8258d2f47e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_53e618ad-0c19-4d2c-b665-373212b763a9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_efba242a-445d-4fef-ad37-8e8258d2f47e" xlink:to="loc_us-gaap_SegmentDomain_53e618ad-0c19-4d2c-b665-373212b763a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_BusinessMember_33101cb3-04d7-4f41-9a5e-b57bc5dca1c7" xlink:href="lpsn-20240630.xsd#lpsn_BusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_53e618ad-0c19-4d2c-b665-373212b763a9" xlink:to="loc_lpsn_BusinessMember_33101cb3-04d7-4f41-9a5e-b57bc5dca1c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_2d97f29a-d594-4274-80cc-a99fd132a3b5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_9c1abb55-0d8a-4c59-8a1b-ee6bab655153" xlink:to="loc_us-gaap_GoodwillRollForward_2d97f29a-d594-4274-80cc-a99fd132a3b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_28fce820-f3ec-4230-9689-40c986990a84" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_2d97f29a-d594-4274-80cc-a99fd132a3b5" xlink:to="loc_us-gaap_Goodwill_28fce820-f3ec-4230-9689-40c986990a84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_58692787-9e5a-4b11-aad8-38a9de6e5201" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_2d97f29a-d594-4274-80cc-a99fd132a3b5" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_58692787-9e5a-4b11-aad8-38a9de6e5201" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_93dbe25a-e13e-4d87-b2cd-33c28b718dda" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_2d97f29a-d594-4274-80cc-a99fd132a3b5" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_93dbe25a-e13e-4d87-b2cd-33c28b718dda" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_67735b42-e559-43a3-9dec-e88ec091e717" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Goodwill"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/GoodwillandIntangibleAssetsNarrativeDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#GoodwillandIntangibleAssetsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/GoodwillandIntangibleAssetsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_8b5e3000-0eec-4fdb-8fb5-c95f4048b8db" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_f5c50747-8396-44f7-bd7b-05cc6ed6efe0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_8b5e3000-0eec-4fdb-8fb5-c95f4048b8db" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_f5c50747-8396-44f7-bd7b-05cc6ed6efe0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_850043a2-abe6-47a0-9458-4fc8d19f18c1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_f5c50747-8396-44f7-bd7b-05cc6ed6efe0" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_850043a2-abe6-47a0-9458-4fc8d19f18c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_850043a2-abe6-47a0-9458-4fc8d19f18c1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_850043a2-abe6-47a0-9458-4fc8d19f18c1" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_850043a2-abe6-47a0-9458-4fc8d19f18c1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_16ed8859-0deb-44ea-b6e4-21e1cf529a19" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_850043a2-abe6-47a0-9458-4fc8d19f18c1" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_16ed8859-0deb-44ea-b6e4-21e1cf529a19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_84e604ad-66e1-442c-ba60-3ab2534bc608" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_16ed8859-0deb-44ea-b6e4-21e1cf529a19" xlink:to="loc_us-gaap_CostOfSalesMember_84e604ad-66e1-442c-ba60-3ab2534bc608" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis_d2c0e200-908e-434f-8df9-ffce491ad7a1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_f5c50747-8396-44f7-bd7b-05cc6ed6efe0" xlink:to="loc_us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis_d2c0e200-908e-434f-8df9-ffce491ad7a1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncashOrPartNoncashAcquisitionNameDomain_d2c0e200-908e-434f-8df9-ffce491ad7a1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NoncashOrPartNoncashAcquisitionNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis_d2c0e200-908e-434f-8df9-ffce491ad7a1" xlink:to="loc_us-gaap_NoncashOrPartNoncashAcquisitionNameDomain_d2c0e200-908e-434f-8df9-ffce491ad7a1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncashOrPartNoncashAcquisitionNameDomain_008cd3d7-579a-437c-9d1f-ef90bc833071" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NoncashOrPartNoncashAcquisitionNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis_d2c0e200-908e-434f-8df9-ffce491ad7a1" xlink:to="loc_us-gaap_NoncashOrPartNoncashAcquisitionNameDomain_008cd3d7-579a-437c-9d1f-ef90bc833071" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_WildHealthMember_c5c55e5f-d1de-45d4-8c18-34618259f802" xlink:href="lpsn-20240630.xsd#lpsn_WildHealthMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionNameDomain_008cd3d7-579a-437c-9d1f-ef90bc833071" xlink:to="loc_lpsn_WildHealthMember_c5c55e5f-d1de-45d4-8c18-34618259f802" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_4ad9b6f4-e595-45e7-a2ab-b2e0a5196307" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_f5c50747-8396-44f7-bd7b-05cc6ed6efe0" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_4ad9b6f4-e595-45e7-a2ab-b2e0a5196307" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_4ad9b6f4-e595-45e7-a2ab-b2e0a5196307_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_4ad9b6f4-e595-45e7-a2ab-b2e0a5196307" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_4ad9b6f4-e595-45e7-a2ab-b2e0a5196307_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_b38ae737-e8d0-4f64-8e5b-e522ff995e47" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_4ad9b6f4-e595-45e7-a2ab-b2e0a5196307" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_b38ae737-e8d0-4f64-8e5b-e522ff995e47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_WildHealthMember_8b6b1316-66c1-4ff3-ba02-3781d2be90a9" xlink:href="lpsn-20240630.xsd#lpsn_WildHealthMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_b38ae737-e8d0-4f64-8e5b-e522ff995e47" xlink:to="loc_lpsn_WildHealthMember_8b6b1316-66c1-4ff3-ba02-3781d2be90a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_3f933ff8-de35-43b4-85c3-b668d56724f4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_f5c50747-8396-44f7-bd7b-05cc6ed6efe0" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_3f933ff8-de35-43b4-85c3-b668d56724f4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_3f933ff8-de35-43b4-85c3-b668d56724f4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_3f933ff8-de35-43b4-85c3-b668d56724f4" xlink:to="loc_us-gaap_SegmentDomain_3f933ff8-de35-43b4-85c3-b668d56724f4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_d0471f5b-6210-4156-957f-44470af58a4e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_3f933ff8-de35-43b4-85c3-b668d56724f4" xlink:to="loc_us-gaap_SegmentDomain_d0471f5b-6210-4156-957f-44470af58a4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_BusinessMember_ee53a9f4-c328-4ddd-88de-16167f42a190" xlink:href="lpsn-20240630.xsd#lpsn_BusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d0471f5b-6210-4156-957f-44470af58a4e" xlink:to="loc_lpsn_BusinessMember_ee53a9f4-c328-4ddd-88de-16167f42a190" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetImpairmentCharges_8f95b6b0-d9bb-451e-a3f6-399ce569a680" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_8b5e3000-0eec-4fdb-8fb5-c95f4048b8db" xlink:to="loc_us-gaap_AssetImpairmentCharges_8f95b6b0-d9bb-451e-a3f6-399ce569a680" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_00436fa7-d84e-4af5-97b7-5153d1351b46" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_8b5e3000-0eec-4fdb-8fb5-c95f4048b8db" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_00436fa7-d84e-4af5-97b7-5153d1351b46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_005b0d80-08ff-43d8-b3de-ed57ce16cfa2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_8b5e3000-0eec-4fdb-8fb5-c95f4048b8db" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_005b0d80-08ff-43d8-b3de-ed57ce16cfa2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSoldAmortization_0ecfbe24-1193-4643-9cf1-e0df73f77af1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CostOfGoodsAndServicesSoldAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_8b5e3000-0eec-4fdb-8fb5-c95f4048b8db" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSoldAmortization_0ecfbe24-1193-4643-9cf1-e0df73f77af1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetImpairmentCharges_0b730953-953d-48fd-a43e-725a3af624b5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_8b5e3000-0eec-4fdb-8fb5-c95f4048b8db" xlink:to="loc_us-gaap_OtherAssetImpairmentCharges_0b730953-953d-48fd-a43e-725a3af624b5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill_1c9188be-dce9-4b0c-bc43-25fe0c8eaaae" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_8b5e3000-0eec-4fdb-8fb5-c95f4048b8db" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill_1c9188be-dce9-4b0c-bc43-25fe0c8eaaae" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/GoodwillandIntangibleAssetsIntangibleAssetsDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#GoodwillandIntangibleAssetsIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/GoodwillandIntangibleAssetsIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_847dfe13-87e3-4c8c-9e52-d1132cbb58cc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_40c7b715-ded2-4656-861d-facd535ddf30" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_847dfe13-87e3-4c8c-9e52-d1132cbb58cc" xlink:to="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_40c7b715-ded2-4656-861d-facd535ddf30" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_b00bdca3-a090-4e2a-9a29-4ff97420c776" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_40c7b715-ded2-4656-861d-facd535ddf30" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_b00bdca3-a090-4e2a-9a29-4ff97420c776" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b00bdca3-a090-4e2a-9a29-4ff97420c776_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_b00bdca3-a090-4e2a-9a29-4ff97420c776" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b00bdca3-a090-4e2a-9a29-4ff97420c776_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_27b81eaf-ab01-48b8-9375-0911f6e02fd6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_b00bdca3-a090-4e2a-9a29-4ff97420c776" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_27b81eaf-ab01-48b8-9375-0911f6e02fd6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_TechnologyMember_42dd728c-fba6-4ea3-91a4-d91688aae765" xlink:href="lpsn-20240630.xsd#lpsn_TechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_27b81eaf-ab01-48b8-9375-0911f6e02fd6" xlink:to="loc_lpsn_TechnologyMember_42dd728c-fba6-4ea3-91a4-d91688aae765" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerContractsMember_363b8039-07b3-4933-a2ad-43693c5f5353" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CustomerContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_27b81eaf-ab01-48b8-9375-0911f6e02fd6" xlink:to="loc_us-gaap_CustomerContractsMember_363b8039-07b3-4933-a2ad-43693c5f5353" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PatentsMember_379d9512-fe21-474b-ba60-d533cd5617e7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PatentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_27b81eaf-ab01-48b8-9375-0911f6e02fd6" xlink:to="loc_us-gaap_PatentsMember_379d9512-fe21-474b-ba60-d533cd5617e7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksMember_ab294974-b83a-48bc-a8c9-f2f9e69a9a77" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TrademarksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_27b81eaf-ab01-48b8-9375-0911f6e02fd6" xlink:to="loc_us-gaap_TrademarksMember_ab294974-b83a-48bc-a8c9-f2f9e69a9a77" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_4989015b-59a7-4edf-abed-6566fd17faa2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_27b81eaf-ab01-48b8-9375-0911f6e02fd6" xlink:to="loc_us-gaap_TradeNamesMember_4989015b-59a7-4edf-abed-6566fd17faa2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_c7ff65bc-0f8d-4efa-b86a-75cb76d75a08" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_27b81eaf-ab01-48b8-9375-0911f6e02fd6" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_c7ff65bc-0f8d-4efa-b86a-75cb76d75a08" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_56ae1d1e-35bb-42e8-b5e4-82b90f21f63d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_847dfe13-87e3-4c8c-9e52-d1132cbb58cc" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_56ae1d1e-35bb-42e8-b5e4-82b90f21f63d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_0768a726-b9b0-4134-b2e5-cb2a4fa5ab46" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_847dfe13-87e3-4c8c-9e52-d1132cbb58cc" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_0768a726-b9b0-4134-b2e5-cb2a4fa5ab46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_f1666957-edcd-4a27-8eb5-ba859c931c04" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_847dfe13-87e3-4c8c-9e52-d1132cbb58cc" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_f1666957-edcd-4a27-8eb5-ba859c931c04" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_cd623752-7133-458f-8684-0606cb505926" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_847dfe13-87e3-4c8c-9e52-d1132cbb58cc" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_cd623752-7133-458f-8684-0606cb505926" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/PropertyandEquipmentDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#PropertyandEquipmentDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/PropertyandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_338d413f-7d9b-45c2-81ef-440c57f6e6d5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_6796a748-d5c4-4ebe-a5e2-6618bf925c8a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_338d413f-7d9b-45c2-81ef-440c57f6e6d5" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_6796a748-d5c4-4ebe-a5e2-6618bf925c8a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_277422c1-7397-4b23-8d34-bf691788a246" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_6796a748-d5c4-4ebe-a5e2-6618bf925c8a" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_277422c1-7397-4b23-8d34-bf691788a246" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_277422c1-7397-4b23-8d34-bf691788a246_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_277422c1-7397-4b23-8d34-bf691788a246" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_277422c1-7397-4b23-8d34-bf691788a246_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_e5e3f1f8-4845-449b-92a3-cd737049738c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_277422c1-7397-4b23-8d34-bf691788a246" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_e5e3f1f8-4845-449b-92a3-cd737049738c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ComputerEquipmentAndSoftwareMember_e489a059-cd05-495b-84ca-5f98a8b505ed" xlink:href="lpsn-20240630.xsd#lpsn_ComputerEquipmentAndSoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_e5e3f1f8-4845-449b-92a3-cd737049738c" xlink:to="loc_lpsn_ComputerEquipmentAndSoftwareMember_e489a059-cd05-495b-84ca-5f98a8b505ed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareDevelopmentMember_639a1c07-0238-4571-a18a-598756293ee5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SoftwareDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_e5e3f1f8-4845-449b-92a3-cd737049738c" xlink:to="loc_us-gaap_SoftwareDevelopmentMember_639a1c07-0238-4571-a18a-598756293ee5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_FurnitureEquipmentAndBuildingImprovementsMember_6e620f7c-ef5f-47fe-b60d-267201af5d43" xlink:href="lpsn-20240630.xsd#lpsn_FurnitureEquipmentAndBuildingImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_e5e3f1f8-4845-449b-92a3-cd737049738c" xlink:to="loc_lpsn_FurnitureEquipmentAndBuildingImprovementsMember_6e620f7c-ef5f-47fe-b60d-267201af5d43" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_08e2b927-abca-4c2d-8fef-e0be1e377270" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_6796a748-d5c4-4ebe-a5e2-6618bf925c8a" xlink:to="loc_srt_RangeAxis_08e2b927-abca-4c2d-8fef-e0be1e377270" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_08e2b927-abca-4c2d-8fef-e0be1e377270_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_08e2b927-abca-4c2d-8fef-e0be1e377270" xlink:to="loc_srt_RangeMember_08e2b927-abca-4c2d-8fef-e0be1e377270_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_66ba9d44-434a-4674-baa8-dde71b340d22" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_08e2b927-abca-4c2d-8fef-e0be1e377270" xlink:to="loc_srt_RangeMember_66ba9d44-434a-4674-baa8-dde71b340d22" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_95a513de-f7fd-427a-8888-428940bd2f7f" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_66ba9d44-434a-4674-baa8-dde71b340d22" xlink:to="loc_srt_MinimumMember_95a513de-f7fd-427a-8888-428940bd2f7f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_30216817-7562-4537-b255-eeef034dde5d" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_66ba9d44-434a-4674-baa8-dde71b340d22" xlink:to="loc_srt_MaximumMember_30216817-7562-4537-b255-eeef034dde5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_c305fb70-009a-40c8-98aa-cdfe7868d9c8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_338d413f-7d9b-45c2-81ef-440c57f6e6d5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_c305fb70-009a-40c8-98aa-cdfe7868d9c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_b57e243f-d2dd-4661-9b15-17cbd123e500" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_338d413f-7d9b-45c2-81ef-440c57f6e6d5" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_b57e243f-d2dd-4661-9b15-17cbd123e500" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_dd3c11bf-bca0-4f5e-a4c3-779eb5e49b09" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_338d413f-7d9b-45c2-81ef-440c57f6e6d5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_dd3c11bf-bca0-4f5e-a4c3-779eb5e49b09" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_58422ae8-09e3-4282-be6f-66d19248751c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_338d413f-7d9b-45c2-81ef-440c57f6e6d5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_58422ae8-09e3-4282-be6f-66d19248751c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_2918d35d-9583-4518-a329-261bd3285a16" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_338d413f-7d9b-45c2-81ef-440c57f6e6d5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_2918d35d-9583-4518-a329-261bd3285a16" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_91d085ff-e0ea-4149-add1-61d55e275e07" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_338d413f-7d9b-45c2-81ef-440c57f6e6d5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_91d085ff-e0ea-4149-add1-61d55e275e07" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeFinanceLeaseTermOfContract1_d274849f-3ec2-4a07-862d-b3514710bdff" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeFinanceLeaseTermOfContract1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_338d413f-7d9b-45c2-81ef-440c57f6e6d5" xlink:to="loc_us-gaap_LesseeFinanceLeaseTermOfContract1_d274849f-3ec2-4a07-862d-b3514710bdff" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/PropertyandEquipmentScheduleofDepreciationDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#PropertyandEquipmentScheduleofDepreciationDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/PropertyandEquipmentScheduleofDepreciationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_48a40472-8e43-48a8-b0f9-24c434ead2bc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_5d3b0bca-81f3-42c4-bc77-90a2eab37899" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_48a40472-8e43-48a8-b0f9-24c434ead2bc" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_5d3b0bca-81f3-42c4-bc77-90a2eab37899" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_01ccccf1-507b-49ad-935e-937218ba3a14" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_5d3b0bca-81f3-42c4-bc77-90a2eab37899" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_01ccccf1-507b-49ad-935e-937218ba3a14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_01ccccf1-507b-49ad-935e-937218ba3a14_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_01ccccf1-507b-49ad-935e-937218ba3a14" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_01ccccf1-507b-49ad-935e-937218ba3a14_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_cd577620-d770-4f3f-9f91-13fae324f646" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_01ccccf1-507b-49ad-935e-937218ba3a14" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_cd577620-d770-4f3f-9f91-13fae324f646" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_14794498-9162-41ab-90cc-8b02fa486d0a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_cd577620-d770-4f3f-9f91-13fae324f646" xlink:to="loc_us-gaap_CostOfSalesMember_14794498-9162-41ab-90cc-8b02fa486d0a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_e62e594b-a8ff-45d8-b5e2-d05e05ef5ec6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SellingAndMarketingExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_cd577620-d770-4f3f-9f91-13fae324f646" xlink:to="loc_us-gaap_SellingAndMarketingExpenseMember_e62e594b-a8ff-45d8-b5e2-d05e05ef5ec6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_a75eea2c-03c7-4579-9608-e6e780811c45" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GeneralAndAdministrativeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_cd577620-d770-4f3f-9f91-13fae324f646" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_a75eea2c-03c7-4579-9608-e6e780811c45" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_d0a5b16a-771d-4f66-a10a-2d85f78be25a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_cd577620-d770-4f3f-9f91-13fae324f646" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_d0a5b16a-771d-4f66-a10a-2d85f78be25a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationNonproduction_ce9639de-cc0c-495c-8f94-79523307d40d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DepreciationNonproduction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_48a40472-8e43-48a8-b0f9-24c434ead2bc" xlink:to="loc_us-gaap_DepreciationNonproduction_ce9639de-cc0c-495c-8f94-79523307d40d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/ConvertibleSeniorNotesNetofCurrentPortionCappedCallTransactionsandWarrantsNarrativeDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#ConvertibleSeniorNotesNetofCurrentPortionCappedCallTransactionsandWarrantsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/ConvertibleSeniorNotesNetofCurrentPortionCappedCallTransactionsandWarrantsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_c2b2a6a1-808e-4151-90d5-9186d2f20e3c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_DebtInstrumentTable_c2b2a6a1-808e-4151-90d5-9186d2f20e3c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_ec5e99db-28c4-46d0-8e98-e0749bee5d1a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c2b2a6a1-808e-4151-90d5-9186d2f20e3c" xlink:to="loc_us-gaap_DebtInstrumentAxis_ec5e99db-28c4-46d0-8e98-e0749bee5d1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_ec5e99db-28c4-46d0-8e98-e0749bee5d1a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_ec5e99db-28c4-46d0-8e98-e0749bee5d1a" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_ec5e99db-28c4-46d0-8e98-e0749bee5d1a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_d35a6278-acdc-4e6a-8f88-ec676fe496ba" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_ec5e99db-28c4-46d0-8e98-e0749bee5d1a" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_d35a6278-acdc-4e6a-8f88-ec676fe496ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesDue2024Member_d4a1381a-d2c2-4e8d-968b-32d6a4e4b45e" xlink:href="lpsn-20240630.xsd#lpsn_ConvertibleSeniorNotesDue2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d35a6278-acdc-4e6a-8f88-ec676fe496ba" xlink:to="loc_lpsn_ConvertibleSeniorNotesDue2024Member_d4a1381a-d2c2-4e8d-968b-32d6a4e4b45e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesDue2026Member_32614676-6d2a-4e9d-93d3-c275884039f0" xlink:href="lpsn-20240630.xsd#lpsn_ConvertibleSeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d35a6278-acdc-4e6a-8f88-ec676fe496ba" xlink:to="loc_lpsn_ConvertibleSeniorNotesDue2026Member_32614676-6d2a-4e9d-93d3-c275884039f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_CappedCallsMember_4a96e072-2484-4800-88d4-02202db3cb8e" xlink:href="lpsn-20240630.xsd#lpsn_CappedCallsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d35a6278-acdc-4e6a-8f88-ec676fe496ba" xlink:to="loc_lpsn_CappedCallsMember_4a96e072-2484-4800-88d4-02202db3cb8e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesDue2029Member_f31d51fa-50bd-47bb-9f35-228a5058f043" xlink:href="lpsn-20240630.xsd#lpsn_ConvertibleSeniorNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d35a6278-acdc-4e6a-8f88-ec676fe496ba" xlink:to="loc_lpsn_ConvertibleSeniorNotesDue2029Member_f31d51fa-50bd-47bb-9f35-228a5058f043" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ExchangeAndPurchaseAgreementMember_34db9865-7123-4b46-9485-e785ff298026" xlink:href="lpsn-20240630.xsd#lpsn_ExchangeAndPurchaseAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d35a6278-acdc-4e6a-8f88-ec676fe496ba" xlink:to="loc_lpsn_ExchangeAndPurchaseAgreementMember_34db9865-7123-4b46-9485-e785ff298026" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_876678d3-1917-4c61-9863-4d604dabe2a4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c2b2a6a1-808e-4151-90d5-9186d2f20e3c" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_876678d3-1917-4c61-9863-4d604dabe2a4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_876678d3-1917-4c61-9863-4d604dabe2a4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_876678d3-1917-4c61-9863-4d604dabe2a4" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_876678d3-1917-4c61-9863-4d604dabe2a4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_50fc9adf-7b54-4414-a8c7-59c960f419fb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_876678d3-1917-4c61-9863-4d604dabe2a4" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_50fc9adf-7b54-4414-a8c7-59c960f419fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_a8720114-c61a-4f18-a8b6-85f7b41281df" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_50fc9adf-7b54-4414-a8c7-59c960f419fb" xlink:to="loc_us-gaap_ConvertibleDebtMember_a8720114-c61a-4f18-a8b6-85f7b41281df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAxis_1e703088-89f9-49dd-8e78-fea3f0628520" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c2b2a6a1-808e-4151-90d5-9186d2f20e3c" xlink:to="loc_srt_RestatementAxis_1e703088-89f9-49dd-8e78-fea3f0628520" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_1e703088-89f9-49dd-8e78-fea3f0628520_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_1e703088-89f9-49dd-8e78-fea3f0628520" xlink:to="loc_srt_RestatementDomain_1e703088-89f9-49dd-8e78-fea3f0628520_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_f0b22e32-d8a5-4378-9589-d036f2ee7fad" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_1e703088-89f9-49dd-8e78-fea3f0628520" xlink:to="loc_srt_RestatementDomain_f0b22e32-d8a5-4378-9589-d036f2ee7fad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioPreviouslyReportedMember_d4654ede-7f98-4746-8a1e-832c88b15eaf" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScenarioPreviouslyReportedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_f0b22e32-d8a5-4378-9589-d036f2ee7fad" xlink:to="loc_srt_ScenarioPreviouslyReportedMember_d4654ede-7f98-4746-8a1e-832c88b15eaf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAdjustmentMember_62d9413e-a42d-4a86-81f2-51e22fd2ebab" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_f0b22e32-d8a5-4378-9589-d036f2ee7fad" xlink:to="loc_srt_RestatementAdjustmentMember_62d9413e-a42d-4a86-81f2-51e22fd2ebab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_ff320500-62ba-4012-8e2b-a4c9fbc156db" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c2b2a6a1-808e-4151-90d5-9186d2f20e3c" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_ff320500-62ba-4012-8e2b-a4c9fbc156db" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_ff320500-62ba-4012-8e2b-a4c9fbc156db_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_ff320500-62ba-4012-8e2b-a4c9fbc156db" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_ff320500-62ba-4012-8e2b-a4c9fbc156db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_66ec088e-ddad-4acc-8f80-03b814a242d3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_ff320500-62ba-4012-8e2b-a4c9fbc156db" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_66ec088e-ddad-4acc-8f80-03b814a242d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ShareSettledWarrantsMember_867add46-eb55-4d41-b9af-299c1ebb8d70" xlink:href="lpsn-20240630.xsd#lpsn_ShareSettledWarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_66ec088e-ddad-4acc-8f80-03b814a242d3" xlink:to="loc_lpsn_ShareSettledWarrantsMember_867add46-eb55-4d41-b9af-299c1ebb8d70" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_CashSettledWarrantsMember_44fef2e1-f239-4d5e-a074-9b9aa1dbc166" xlink:href="lpsn-20240630.xsd#lpsn_CashSettledWarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_66ec088e-ddad-4acc-8f80-03b814a242d3" xlink:to="loc_lpsn_CashSettledWarrantsMember_44fef2e1-f239-4d5e-a074-9b9aa1dbc166" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_InterestRateComponentAxis_1095f105-4c76-4a32-940c-93f9ddaf0a80" xlink:href="lpsn-20240630.xsd#lpsn_InterestRateComponentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c2b2a6a1-808e-4151-90d5-9186d2f20e3c" xlink:to="loc_lpsn_InterestRateComponentAxis_1095f105-4c76-4a32-940c-93f9ddaf0a80" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_InterestRateComponentDomain_1095f105-4c76-4a32-940c-93f9ddaf0a80_default" xlink:href="lpsn-20240630.xsd#lpsn_InterestRateComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_lpsn_InterestRateComponentAxis_1095f105-4c76-4a32-940c-93f9ddaf0a80" xlink:to="loc_lpsn_InterestRateComponentDomain_1095f105-4c76-4a32-940c-93f9ddaf0a80_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_InterestRateComponentDomain_52831f72-eae3-422d-b4cc-0d72007c5b25" xlink:href="lpsn-20240630.xsd#lpsn_InterestRateComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_lpsn_InterestRateComponentAxis_1095f105-4c76-4a32-940c-93f9ddaf0a80" xlink:to="loc_lpsn_InterestRateComponentDomain_52831f72-eae3-422d-b4cc-0d72007c5b25" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_EarlierOfTheDateOfIssuanceOfDelayedDrawNotesAndDecember15.2026Member_b115b25d-faa3-4ec7-860c-b1d873a917a3" xlink:href="lpsn-20240630.xsd#lpsn_EarlierOfTheDateOfIssuanceOfDelayedDrawNotesAndDecember15.2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_InterestRateComponentDomain_52831f72-eae3-422d-b4cc-0d72007c5b25" xlink:to="loc_lpsn_EarlierOfTheDateOfIssuanceOfDelayedDrawNotesAndDecember15.2026Member_b115b25d-faa3-4ec7-860c-b1d873a917a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_FromDateOfIssuanceOfDelayedDrawNotesAndPriorToDecember152026Member_e1b5a31a-c353-4dc2-8abf-ab84c1b71a8d" xlink:href="lpsn-20240630.xsd#lpsn_FromDateOfIssuanceOfDelayedDrawNotesAndPriorToDecember152026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_InterestRateComponentDomain_52831f72-eae3-422d-b4cc-0d72007c5b25" xlink:to="loc_lpsn_FromDateOfIssuanceOfDelayedDrawNotesAndPriorToDecember152026Member_e1b5a31a-c353-4dc2-8abf-ab84c1b71a8d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_OnOrAfterDecember152026Member_c9d0b698-56b6-4657-b797-efd55ae91538" xlink:href="lpsn-20240630.xsd#lpsn_OnOrAfterDecember152026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_InterestRateComponentDomain_52831f72-eae3-422d-b4cc-0d72007c5b25" xlink:to="loc_lpsn_OnOrAfterDecember152026Member_c9d0b698-56b6-4657-b797-efd55ae91538" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_f8c79297-6d78-4e1d-a50a-fdcb0147a3fc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c2b2a6a1-808e-4151-90d5-9186d2f20e3c" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_f8c79297-6d78-4e1d-a50a-fdcb0147a3fc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_f8c79297-6d78-4e1d-a50a-fdcb0147a3fc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_f8c79297-6d78-4e1d-a50a-fdcb0147a3fc" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_f8c79297-6d78-4e1d-a50a-fdcb0147a3fc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_caded66a-9439-42f3-9e9d-d3de816eb9b5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_f8c79297-6d78-4e1d-a50a-fdcb0147a3fc" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_caded66a-9439-42f3-9e9d-d3de816eb9b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_2f096f79-51ec-4aa1-9770-7bfd8ca0ae7a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPeriodOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_caded66a-9439-42f3-9e9d-d3de816eb9b5" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_2f096f79-51ec-4aa1-9770-7bfd8ca0ae7a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_d5e13f62-e7b1-4173-a653-eae9e74ecca5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPeriodTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_caded66a-9439-42f3-9e9d-d3de816eb9b5" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_d5e13f62-e7b1-4173-a653-eae9e74ecca5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_2aa4592a-c88c-442a-9437-3fb603a897b5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPeriodThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_caded66a-9439-42f3-9e9d-d3de816eb9b5" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_2aa4592a-c88c-442a-9437-3fb603a897b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DebtInstrumentRedemptionFundamentalChangeMember_defc3d12-f5cf-46b1-b93d-830759f5ff32" xlink:href="lpsn-20240630.xsd#lpsn_DebtInstrumentRedemptionFundamentalChangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_caded66a-9439-42f3-9e9d-d3de816eb9b5" xlink:to="loc_lpsn_DebtInstrumentRedemptionFundamentalChangeMember_defc3d12-f5cf-46b1-b93d-830759f5ff32" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DebtInstrumentRedemptionFirstLienConvertibleNotesMember_105bbd56-f982-4013-bde0-7ff665ea3787" xlink:href="lpsn-20240630.xsd#lpsn_DebtInstrumentRedemptionFirstLienConvertibleNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_caded66a-9439-42f3-9e9d-d3de816eb9b5" xlink:to="loc_lpsn_DebtInstrumentRedemptionFirstLienConvertibleNotesMember_105bbd56-f982-4013-bde0-7ff665ea3787" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_fecf8d72-95eb-49e7-a8ac-926a4b325b81" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c2b2a6a1-808e-4151-90d5-9186d2f20e3c" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_fecf8d72-95eb-49e7-a8ac-926a4b325b81" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_fecf8d72-95eb-49e7-a8ac-926a4b325b81_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_fecf8d72-95eb-49e7-a8ac-926a4b325b81" xlink:to="loc_us-gaap_RelatedPartyDomain_fecf8d72-95eb-49e7-a8ac-926a4b325b81_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_071870ce-5e98-4947-a736-9f1383bad7d5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_fecf8d72-95eb-49e7-a8ac-926a4b325b81" xlink:to="loc_us-gaap_RelatedPartyDomain_071870ce-5e98-4947-a736-9f1383bad7d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestorMember_d8165e7a-124d-4e2b-aecb-2932b2b308d3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_071870ce-5e98-4947-a736-9f1383bad7d5" xlink:to="loc_us-gaap_InvestorMember_d8165e7a-124d-4e2b-aecb-2932b2b308d3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DebtInstrumentConvertibleTermsOfConversionAxis_df29c1f7-d57a-4c0c-8515-bb746a33622c" xlink:href="lpsn-20240630.xsd#lpsn_DebtInstrumentConvertibleTermsOfConversionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c2b2a6a1-808e-4151-90d5-9186d2f20e3c" xlink:to="loc_lpsn_DebtInstrumentConvertibleTermsOfConversionAxis_df29c1f7-d57a-4c0c-8515-bb746a33622c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DebtInstrumentConvertibleTermsOfConversionDomain_df29c1f7-d57a-4c0c-8515-bb746a33622c_default" xlink:href="lpsn-20240630.xsd#lpsn_DebtInstrumentConvertibleTermsOfConversionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_lpsn_DebtInstrumentConvertibleTermsOfConversionAxis_df29c1f7-d57a-4c0c-8515-bb746a33622c" xlink:to="loc_lpsn_DebtInstrumentConvertibleTermsOfConversionDomain_df29c1f7-d57a-4c0c-8515-bb746a33622c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DebtInstrumentConvertibleTermsOfConversionDomain_aa9edac3-e0f8-448f-820f-b33e04ee141a" xlink:href="lpsn-20240630.xsd#lpsn_DebtInstrumentConvertibleTermsOfConversionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_lpsn_DebtInstrumentConvertibleTermsOfConversionAxis_df29c1f7-d57a-4c0c-8515-bb746a33622c" xlink:to="loc_lpsn_DebtInstrumentConvertibleTermsOfConversionDomain_aa9edac3-e0f8-448f-820f-b33e04ee141a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DebtConversionTermsOneMember_8e4ec7d1-3bb4-48f1-b860-75d0bc20a609" xlink:href="lpsn-20240630.xsd#lpsn_DebtConversionTermsOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_DebtInstrumentConvertibleTermsOfConversionDomain_aa9edac3-e0f8-448f-820f-b33e04ee141a" xlink:to="loc_lpsn_DebtConversionTermsOneMember_8e4ec7d1-3bb4-48f1-b860-75d0bc20a609" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DebtConversionTermsTwoMember_3daa002c-85f5-47fb-95d7-a2dcf10dc461" xlink:href="lpsn-20240630.xsd#lpsn_DebtConversionTermsTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_DebtInstrumentConvertibleTermsOfConversionDomain_aa9edac3-e0f8-448f-820f-b33e04ee141a" xlink:to="loc_lpsn_DebtConversionTermsTwoMember_3daa002c-85f5-47fb-95d7-a2dcf10dc461" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_0a54ce2b-5b7a-48c8-ac23-05c1eb9436de" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_0a54ce2b-5b7a-48c8-ac23-05c1eb9436de" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_ac1da885-3fb7-415d-abc4-0a06cf8068dc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_ac1da885-3fb7-415d-abc4-0a06cf8068dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRepurchaseAmount_2020133d-94c0-4b29-8eb3-023fc790e32b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRepurchaseAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_DebtInstrumentRepurchaseAmount_2020133d-94c0-4b29-8eb3-023fc790e32b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentIncreaseDecreaseForPeriodNet_0d212ed7-0038-4fab-a4ea-d4bf9870094c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentIncreaseDecreaseForPeriodNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_DebtInstrumentIncreaseDecreaseForPeriodNet_0d212ed7-0038-4fab-a4ea-d4bf9870094c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_19614aeb-efb4-4921-ad5a-a83208a16417" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_19614aeb-efb4-4921-ad5a-a83208a16417" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtExtinguishmentCosts_d241a776-a9f4-4a01-86de-839f901bcada" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsOfDebtExtinguishmentCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_PaymentsOfDebtExtinguishmentCosts_d241a776-a9f4-4a01-86de-839f901bcada" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_7c7a3e61-f992-46c5-ba7d-04d3bb7ee86f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromDebtNetOfIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_7c7a3e61-f992-46c5-ba7d-04d3bb7ee86f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionRatio1_a09ab80b-519f-41cb-a429-a1d6e1350bc6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentConvertibleConversionRatio1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionRatio1_a09ab80b-519f-41cb-a429-a1d6e1350bc6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_9de781c6-4b66-4642-8b60-0da663e0c794" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_9de781c6-4b66-4642-8b60-0da663e0c794" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_a1f59687-3cf1-4240-a1d8-04ccfb64393b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentConvertibleThresholdTradingDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_a1f59687-3cf1-4240-a1d8-04ccfb64393b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_a793fef2-ee19-457d-a9f7-84cfab46f7df" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_a793fef2-ee19-457d-a9f7-84cfab46f7df" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_3a10aa14-f031-43c9-94de-aca418eaa0b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_3a10aa14-f031-43c9-94de-aca418eaa0b2" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DebtInstrumentConvertibleFiveDayPeriodThresholdOfProductOfSalePriceOfStockAndConversionRate_e28fdab5-a269-4946-9cbd-a7885e6cc5a8" xlink:href="lpsn-20240630.xsd#lpsn_DebtInstrumentConvertibleFiveDayPeriodThresholdOfProductOfSalePriceOfStockAndConversionRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_lpsn_DebtInstrumentConvertibleFiveDayPeriodThresholdOfProductOfSalePriceOfStockAndConversionRate_e28fdab5-a269-4946-9cbd-a7885e6cc5a8" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleLongTermNotesPayable_3b52eb03-5449-47a0-be04-6da6e64d7f16" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleLongTermNotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_ConvertibleLongTermNotesPayable_3b52eb03-5449-47a0-be04-6da6e64d7f16" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_5c86f25c-50fd-4ed3-bc70-0d4c98e2d491" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_5c86f25c-50fd-4ed3-bc70-0d4c98e2d491" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleRemainingDiscountAmortizationPeriod1_4f042c0e-97f1-4ac9-8861-173fda840dae" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentConvertibleRemainingDiscountAmortizationPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_DebtInstrumentConvertibleRemainingDiscountAmortizationPeriod1_4f042c0e-97f1-4ac9-8861-173fda840dae" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_f7a4d41e-7755-49a7-a673-19e9803cd445" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_f7a4d41e-7755-49a7-a673-19e9803cd445" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_CappedCallsInitialOptionStrikePrice_39dbc346-eadf-4dd5-bcf8-31471c9f5a5f" xlink:href="lpsn-20240630.xsd#lpsn_CappedCallsInitialOptionStrikePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_lpsn_CappedCallsInitialOptionStrikePrice_39dbc346-eadf-4dd5-bcf8-31471c9f5a5f" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_CappedCallsInitialCapPrice_b24cf9a9-5a97-4f2e-bb7f-b5b18b41596e" xlink:href="lpsn-20240630.xsd#lpsn_CappedCallsInitialCapPrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_lpsn_CappedCallsInitialCapPrice_b24cf9a9-5a97-4f2e-bb7f-b5b18b41596e" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_NumberOfSharesOfCommonStockCoveredByCappedCalls_46a868e4-884f-4229-97ff-4102b2ea16fc" xlink:href="lpsn-20240630.xsd#lpsn_NumberOfSharesOfCommonStockCoveredByCappedCalls"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_lpsn_NumberOfSharesOfCommonStockCoveredByCappedCalls_46a868e4-884f-4229-97ff-4102b2ea16fc" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_AdjustmentstoAdditionalPaidinCapitalCappedCallOptionIssuanceCosts_03dbee88-36ee-4668-9b0b-9f28fa624672" xlink:href="lpsn-20240630.xsd#lpsn_AdjustmentstoAdditionalPaidinCapitalCappedCallOptionIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_lpsn_AdjustmentstoAdditionalPaidinCapitalCappedCallOptionIssuanceCosts_03dbee88-36ee-4668-9b0b-9f28fa624672" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_4c85a7f8-9a8f-4617-a848-4ba884530e49" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestExpenseDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_InterestExpenseDebt_4c85a7f8-9a8f-4617-a848-4ba884530e49" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_4d28e081-0c98-4d44-a687-51cd47289685" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_4d28e081-0c98-4d44-a687-51cd47289685" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_4d619c2e-b145-4ba8-a329-ceed55d26b0c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_4d619c2e-b145-4ba8-a329-ceed55d26b0c" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_3e540400-0975-4355-81a9-1dbc8f553e76" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentUnamortizedDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_3e540400-0975-4355-81a9-1dbc8f553e76" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_7b8a86bd-9eba-47e8-a418-3fb89ea105ac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_7b8a86bd-9eba-47e8-a418-3fb89ea105ac" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_7b438e53-b1af-4e3f-b6c2-233646f557b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AmortizationOfFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_7b438e53-b1af-4e3f-b6c2-233646f557b2" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantsAndRightsOutstandingTerm_59fe5ad9-34bf-4df4-8143-d39b2d9fa34b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WarrantsAndRightsOutstandingTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_WarrantsAndRightsOutstandingTerm_59fe5ad9-34bf-4df4-8143-d39b2d9fa34b" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_553dcd88-99f6-4723-9f9d-5d747224092b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_553dcd88-99f6-4723-9f9d-5d747224092b" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_a36f6719-fa8c-45c0-95b0-3d470ea89044" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_a36f6719-fa8c-45c0-95b0-3d470ea89044" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ClassOfWarrantOrRightAvailableCash_9e979777-6091-4d9d-94b2-e9ab518d5961" xlink:href="lpsn-20240630.xsd#lpsn_ClassOfWarrantOrRightAvailableCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_lpsn_ClassOfWarrantOrRightAvailableCash_9e979777-6091-4d9d-94b2-e9ab518d5961" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ClassOfWarrantOrRightSettlementAmountAnnualizedInterestRate_508aecf9-149f-423d-abc2-1ae0a7eda6be" xlink:href="lpsn-20240630.xsd#lpsn_ClassOfWarrantOrRightSettlementAmountAnnualizedInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_lpsn_ClassOfWarrantOrRightSettlementAmountAnnualizedInterestRate_508aecf9-149f-423d-abc2-1ae0a7eda6be" xlink:type="arc" order="31"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ClassOfWarrantOrRightBeneficialOwnershipLimitationPercentage_0ced62cf-7e08-49fd-974f-d8c1ce2f66f8" xlink:href="lpsn-20240630.xsd#lpsn_ClassOfWarrantOrRightBeneficialOwnershipLimitationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_lpsn_ClassOfWarrantOrRightBeneficialOwnershipLimitationPercentage_0ced62cf-7e08-49fd-974f-d8c1ce2f66f8" xlink:type="arc" order="32"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ClassOfWarrantOrRightBeneficialOwnershipLimitationTermOfInvestorNotice_30e66974-23b4-4e37-a0c2-ae1875ec10d9" xlink:href="lpsn-20240630.xsd#lpsn_ClassOfWarrantOrRightBeneficialOwnershipLimitationTermOfInvestorNotice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_lpsn_ClassOfWarrantOrRightBeneficialOwnershipLimitationTermOfInvestorNotice_30e66974-23b4-4e37-a0c2-ae1875ec10d9" xlink:type="arc" order="33"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ClassOfWarrantOrRightBeneficialOwnershipLimitationMaximumPercentage_8f0512e8-2d2c-412f-a726-c0c301c42692" xlink:href="lpsn-20240630.xsd#lpsn_ClassOfWarrantOrRightBeneficialOwnershipLimitationMaximumPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_lpsn_ClassOfWarrantOrRightBeneficialOwnershipLimitationMaximumPercentage_8f0512e8-2d2c-412f-a726-c0c301c42692" xlink:type="arc" order="34"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DebtInstrumentInterestRateStatedPercentageCash_6546fca4-51a2-4fb5-b7d1-1b2eb03df84f" xlink:href="lpsn-20240630.xsd#lpsn_DebtInstrumentInterestRateStatedPercentageCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_lpsn_DebtInstrumentInterestRateStatedPercentageCash_6546fca4-51a2-4fb5-b7d1-1b2eb03df84f" xlink:type="arc" order="35"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DebtInstrumentInterestRateStatedPercentagePaidInKind_f8523bb0-6a4f-4731-a150-82123282765c" xlink:href="lpsn-20240630.xsd#lpsn_DebtInstrumentInterestRateStatedPercentagePaidInKind"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_lpsn_DebtInstrumentInterestRateStatedPercentagePaidInKind_f8523bb0-6a4f-4731-a150-82123282765c" xlink:type="arc" order="36"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed_f93c46fa-754b-42ba-a2c5-91ae4cb4e52b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed_f93c46fa-754b-42ba-a2c5-91ae4cb4e52b" xlink:type="arc" order="37"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DebtInstrumentRedemptionPriceAccruedAndUnpaidInterestPercentage_33b860a8-72e6-4282-966b-ae9097e9b508" xlink:href="lpsn-20240630.xsd#lpsn_DebtInstrumentRedemptionPriceAccruedAndUnpaidInterestPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_lpsn_DebtInstrumentRedemptionPriceAccruedAndUnpaidInterestPercentage_33b860a8-72e6-4282-966b-ae9097e9b508" xlink:type="arc" order="38"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DebtInstrumentCovenantMaximumAmountJuniorInLienPriority_aeac84c1-d38e-4968-8724-371ca08ee21c" xlink:href="lpsn-20240630.xsd#lpsn_DebtInstrumentCovenantMaximumAmountJuniorInLienPriority"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_lpsn_DebtInstrumentCovenantMaximumAmountJuniorInLienPriority_aeac84c1-d38e-4968-8724-371ca08ee21c" xlink:type="arc" order="39"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DebtInstrumentCovenantMinimumRequiredCashBalance_1d8bd83c-d0e3-449c-9e66-53a15647006b" xlink:href="lpsn-20240630.xsd#lpsn_DebtInstrumentCovenantMinimumRequiredCashBalance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_lpsn_DebtInstrumentCovenantMinimumRequiredCashBalance_1d8bd83c-d0e3-449c-9e66-53a15647006b" xlink:type="arc" order="40"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DebtInstrumentConvertibleThresholdPrincipalAmount_92ad44ae-28f0-4646-bd06-f7d2aa3c1680" xlink:href="lpsn-20240630.xsd#lpsn_DebtInstrumentConvertibleThresholdPrincipalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_lpsn_DebtInstrumentConvertibleThresholdPrincipalAmount_92ad44ae-28f0-4646-bd06-f7d2aa3c1680" xlink:type="arc" order="41"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DebtInstrumentConvertibleTradingDayObservationPeriod_044b6ea3-65c9-4939-8c41-ffb407e69a12" xlink:href="lpsn-20240630.xsd#lpsn_DebtInstrumentConvertibleTradingDayObservationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_lpsn_DebtInstrumentConvertibleTradingDayObservationPeriod_044b6ea3-65c9-4939-8c41-ffb407e69a12" xlink:type="arc" order="42"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DebtInstrumentRedemptionPriceRemainingFutureInterestPaymentsPercentage_098bf884-2205-49ec-aa8f-edf9769c9842" xlink:href="lpsn-20240630.xsd#lpsn_DebtInstrumentRedemptionPriceRemainingFutureInterestPaymentsPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_lpsn_DebtInstrumentRedemptionPriceRemainingFutureInterestPaymentsPercentage_098bf884-2205-49ec-aa8f-edf9769c9842" xlink:type="arc" order="43"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DebtInstrumentRedemptionPriceDiscountPercentageBasisPoints_e29e8583-cab9-421f-9088-4b3a46c910cb" xlink:href="lpsn-20240630.xsd#lpsn_DebtInstrumentRedemptionPriceDiscountPercentageBasisPoints"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_lpsn_DebtInstrumentRedemptionPriceDiscountPercentageBasisPoints_e29e8583-cab9-421f-9088-4b3a46c910cb" xlink:type="arc" order="44"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ClassOfWarrantOrRightAdditionalAmountAuthorizedForPurchase_f353c77b-868c-40d2-8947-d824ffc8be3c" xlink:href="lpsn-20240630.xsd#lpsn_ClassOfWarrantOrRightAdditionalAmountAuthorizedForPurchase"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_lpsn_ClassOfWarrantOrRightAdditionalAmountAuthorizedForPurchase_f353c77b-868c-40d2-8947-d824ffc8be3c" xlink:type="arc" order="45"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfConvertibleDebt_a55e2c50-29da-4f58-8da8-842ab3101212" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RepaymentsOfConvertibleDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_RepaymentsOfConvertibleDebt_a55e2c50-29da-4f58-8da8-842ab3101212" xlink:type="arc" order="46"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DebtInstrumentRedemptionNumberOfDaysBeforeMaturity_83e3eb8b-8c1d-418e-a314-dee1ab9f2d40" xlink:href="lpsn-20240630.xsd#lpsn_DebtInstrumentRedemptionNumberOfDaysBeforeMaturity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_lpsn_DebtInstrumentRedemptionNumberOfDaysBeforeMaturity_83e3eb8b-8c1d-418e-a314-dee1ab9f2d40" xlink:type="arc" order="47"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_8c5187c9-1229-42b5-93ef-0dfb9959a35c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_LongTermDebtFairValue_8c5187c9-1229-42b5-93ef-0dfb9959a35c" xlink:type="arc" order="48"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_f0c0799d-ad90-4ea2-bd04-d663117e17fe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_f0c0799d-ad90-4ea2-bd04-d663117e17fe" xlink:type="arc" order="49"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantsAndRightsOutstanding_022320ba-2510-4672-a52a-bd379d3a43b5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WarrantsAndRightsOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_WarrantsAndRightsOutstanding_022320ba-2510-4672-a52a-bd379d3a43b5" xlink:type="arc" order="50"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsGross_eddfa48e-c705-4cb7-a9b6-67e36a9cc020" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredFinanceCostsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_us-gaap_DeferredFinanceCostsGross_eddfa48e-c705-4cb7-a9b6-67e36a9cc020" xlink:type="arc" order="51"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DebtInstrumentDiscountGross_098c98e5-ffac-4a37-84e5-e23cd186e5dc" xlink:href="lpsn-20240630.xsd#lpsn_DebtInstrumentDiscountGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9d9b2f7f-6e36-47ab-a423-d09efe62b644" xlink:to="loc_lpsn_DebtInstrumentDiscountGross_098c98e5-ffac-4a37-84e5-e23cd186e5dc" xlink:type="arc" order="52"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/ConvertibleSeniorNotesNetofCurrentPortionCappedCallTransactionsandWarrantsScheduleofCarryingAmountofLiabilityComponentofConvertibleDebtDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#ConvertibleSeniorNotesNetofCurrentPortionCappedCallTransactionsandWarrantsScheduleofCarryingAmountofLiabilityComponentofConvertibleDebtDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/ConvertibleSeniorNotesNetofCurrentPortionCappedCallTransactionsandWarrantsScheduleofCarryingAmountofLiabilityComponentofConvertibleDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_1179bd0b-1b49-4f82-bba0-da209b475763" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_ef614e92-8cdf-4b6d-bd7f-5155cf7c0975" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1179bd0b-1b49-4f82-bba0-da209b475763" xlink:to="loc_us-gaap_DebtInstrumentTable_ef614e92-8cdf-4b6d-bd7f-5155cf7c0975" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_07ecf166-7e87-48f8-9c7f-88101359c49a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_ef614e92-8cdf-4b6d-bd7f-5155cf7c0975" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_07ecf166-7e87-48f8-9c7f-88101359c49a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_07ecf166-7e87-48f8-9c7f-88101359c49a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_07ecf166-7e87-48f8-9c7f-88101359c49a" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_07ecf166-7e87-48f8-9c7f-88101359c49a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_87aa0961-86a6-4b6c-8f20-bb48e3b6c6b1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_07ecf166-7e87-48f8-9c7f-88101359c49a" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_87aa0961-86a6-4b6c-8f20-bb48e3b6c6b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_4ab02cc3-5034-4d25-91e6-2bbcd8583bb9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_87aa0961-86a6-4b6c-8f20-bb48e3b6c6b1" xlink:to="loc_us-gaap_ConvertibleDebtMember_4ab02cc3-5034-4d25-91e6-2bbcd8583bb9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_cd52a7cf-7c52-4d3f-b9fa-b5799d6bdee5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_ef614e92-8cdf-4b6d-bd7f-5155cf7c0975" xlink:to="loc_us-gaap_DebtInstrumentAxis_cd52a7cf-7c52-4d3f-b9fa-b5799d6bdee5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_cd52a7cf-7c52-4d3f-b9fa-b5799d6bdee5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_cd52a7cf-7c52-4d3f-b9fa-b5799d6bdee5" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_cd52a7cf-7c52-4d3f-b9fa-b5799d6bdee5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_6a31bb30-8eb7-42a7-a677-b261732f5bfb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_cd52a7cf-7c52-4d3f-b9fa-b5799d6bdee5" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_6a31bb30-8eb7-42a7-a677-b261732f5bfb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesDue2026Member_d58d7ee3-e006-4676-9887-bad3358465f8" xlink:href="lpsn-20240630.xsd#lpsn_ConvertibleSeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6a31bb30-8eb7-42a7-a677-b261732f5bfb" xlink:to="loc_lpsn_ConvertibleSeniorNotesDue2026Member_d58d7ee3-e006-4676-9887-bad3358465f8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesDue2029Member_7f815c5e-3b67-42af-89ee-d5cfc38c387b" xlink:href="lpsn-20240630.xsd#lpsn_ConvertibleSeniorNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6a31bb30-8eb7-42a7-a677-b261732f5bfb" xlink:to="loc_lpsn_ConvertibleSeniorNotesDue2029Member_7f815c5e-3b67-42af-89ee-d5cfc38c387b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesDue2024Member_57f259bf-5920-4e1f-b9c4-2142669681f2" xlink:href="lpsn-20240630.xsd#lpsn_ConvertibleSeniorNotesDue2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6a31bb30-8eb7-42a7-a677-b261732f5bfb" xlink:to="loc_lpsn_ConvertibleSeniorNotesDue2024Member_57f259bf-5920-4e1f-b9c4-2142669681f2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_feb10a6b-2c63-4268-9ab7-cf29b8961007" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1179bd0b-1b49-4f82-bba0-da209b475763" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_feb10a6b-2c63-4268-9ab7-cf29b8961007" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_b17089f2-a37a-4753-90a6-99042342ba30" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentUnamortizedDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1179bd0b-1b49-4f82-bba0-da209b475763" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_b17089f2-a37a-4753-90a6-99042342ba30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_d13eada6-3843-4f53-8095-7bcbbefbacdf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1179bd0b-1b49-4f82-bba0-da209b475763" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_d13eada6-3843-4f53-8095-7bcbbefbacdf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_2c32e7d2-f6b0-4b55-ba9a-4cdacc243902" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1179bd0b-1b49-4f82-bba0-da209b475763" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_2c32e7d2-f6b0-4b55-ba9a-4cdacc243902" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBorrowings_97464226-c6bc-4f31-a557-c157d04c16e6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShortTermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1179bd0b-1b49-4f82-bba0-da209b475763" xlink:to="loc_us-gaap_ShortTermBorrowings_97464226-c6bc-4f31-a557-c157d04c16e6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_d1e4ed59-71e3-43f5-958d-834950ae9a3b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1179bd0b-1b49-4f82-bba0-da209b475763" xlink:to="loc_us-gaap_LongTermDebt_d1e4ed59-71e3-43f5-958d-834950ae9a3b" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/ConvertibleSeniorNotesNetofCurrentPortionCappedCallTransactionsandWarrantsScheduleofInterestExpenseIncurredDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#ConvertibleSeniorNotesNetofCurrentPortionCappedCallTransactionsandWarrantsScheduleofInterestExpenseIncurredDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/ConvertibleSeniorNotesNetofCurrentPortionCappedCallTransactionsandWarrantsScheduleofInterestExpenseIncurredDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_979d2a04-235f-4dc1-b2f2-7302567a4822" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_4675cc58-9ef0-4ded-ac72-57b8d06896f6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_979d2a04-235f-4dc1-b2f2-7302567a4822" xlink:to="loc_us-gaap_DebtInstrumentTable_4675cc58-9ef0-4ded-ac72-57b8d06896f6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_ebfaea40-5232-41fa-a8b0-873fd1f844e2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4675cc58-9ef0-4ded-ac72-57b8d06896f6" xlink:to="loc_us-gaap_DebtInstrumentAxis_ebfaea40-5232-41fa-a8b0-873fd1f844e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_ebfaea40-5232-41fa-a8b0-873fd1f844e2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_ebfaea40-5232-41fa-a8b0-873fd1f844e2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_ebfaea40-5232-41fa-a8b0-873fd1f844e2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_0ce3c86d-74a6-4f17-b459-aeb790d74338" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_ebfaea40-5232-41fa-a8b0-873fd1f844e2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_0ce3c86d-74a6-4f17-b459-aeb790d74338" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesMember_4139cb3c-13d6-4b60-a081-2aa719780608" xlink:href="lpsn-20240630.xsd#lpsn_ConvertibleSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0ce3c86d-74a6-4f17-b459-aeb790d74338" xlink:to="loc_lpsn_ConvertibleSeniorNotesMember_4139cb3c-13d6-4b60-a081-2aa719780608" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_cdc46c88-4c28-4ba3-b823-d422259b20d1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4675cc58-9ef0-4ded-ac72-57b8d06896f6" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_cdc46c88-4c28-4ba3-b823-d422259b20d1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_cdc46c88-4c28-4ba3-b823-d422259b20d1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_cdc46c88-4c28-4ba3-b823-d422259b20d1" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_cdc46c88-4c28-4ba3-b823-d422259b20d1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_335d8ffb-8bac-423d-95f8-4de573b70829" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_cdc46c88-4c28-4ba3-b823-d422259b20d1" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_335d8ffb-8bac-423d-95f8-4de573b70829" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_0dfc60e5-5f93-4205-b563-3fe9c46c4d7a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_335d8ffb-8bac-423d-95f8-4de573b70829" xlink:to="loc_us-gaap_ConvertibleDebtMember_0dfc60e5-5f93-4205-b563-3fe9c46c4d7a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebtExcludingAmortization_f21a0bdc-b2c6-4f1f-8f26-30d52c5b2a24" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestExpenseDebtExcludingAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_979d2a04-235f-4dc1-b2f2-7302567a4822" xlink:to="loc_us-gaap_InterestExpenseDebtExcludingAmortization_f21a0bdc-b2c6-4f1f-8f26-30d52c5b2a24" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfDebtDiscountPremium_2b02de16-d5fe-4bf4-ab8b-387f0024e927" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AmortizationOfDebtDiscountPremium"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_979d2a04-235f-4dc1-b2f2-7302567a4822" xlink:to="loc_us-gaap_AmortizationOfDebtDiscountPremium_2b02de16-d5fe-4bf4-ab8b-387f0024e927" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_f4e02051-b427-4178-aa82-27d24a998782" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AmortizationOfFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_979d2a04-235f-4dc1-b2f2-7302567a4822" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_f4e02051-b427-4178-aa82-27d24a998782" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_7750f14f-c42a-4cb1-8627-1e8fa552b0da" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestExpenseDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_979d2a04-235f-4dc1-b2f2-7302567a4822" xlink:to="loc_us-gaap_InterestExpenseDebt_7750f14f-c42a-4cb1-8627-1e8fa552b0da" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/LeasesNarrativeDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#LeasesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/LeasesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_535a67a5-1ae1-4f08-b3f9-4dc02d4cc57b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_511a65c1-8b3e-46b4-a600-b29191626970" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_535a67a5-1ae1-4f08-b3f9-4dc02d4cc57b" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_511a65c1-8b3e-46b4-a600-b29191626970" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_ae847e4e-2041-40c7-8917-2a34c2039dce" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_511a65c1-8b3e-46b4-a600-b29191626970" xlink:to="loc_srt_RangeAxis_ae847e4e-2041-40c7-8917-2a34c2039dce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_ae847e4e-2041-40c7-8917-2a34c2039dce_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_ae847e4e-2041-40c7-8917-2a34c2039dce" xlink:to="loc_srt_RangeMember_ae847e4e-2041-40c7-8917-2a34c2039dce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_88aaa637-7ef1-4b7b-aaa1-a5aa0cab50d7" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_ae847e4e-2041-40c7-8917-2a34c2039dce" xlink:to="loc_srt_RangeMember_88aaa637-7ef1-4b7b-aaa1-a5aa0cab50d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_d8e9321c-0a65-4c86-a394-d28c201a6236" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_88aaa637-7ef1-4b7b-aaa1-a5aa0cab50d7" xlink:to="loc_srt_MinimumMember_d8e9321c-0a65-4c86-a394-d28c201a6236" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_2bd5b58d-2acd-46dd-85b5-38166c0a0f18" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_88aaa637-7ef1-4b7b-aaa1-a5aa0cab50d7" xlink:to="loc_srt_MaximumMember_2bd5b58d-2acd-46dd-85b5-38166c0a0f18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseRemainingLeaseTerm_04e6969c-4344-4c7b-b749-c66de1ea3352" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseRemainingLeaseTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_535a67a5-1ae1-4f08-b3f9-4dc02d4cc57b" xlink:to="loc_us-gaap_LesseeOperatingLeaseRemainingLeaseTerm_04e6969c-4344-4c7b-b749-c66de1ea3352" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/FairValueMeasurementsFinancialAssetsandLiabilitiesDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#FairValueMeasurementsFinancialAssetsandLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/FairValueMeasurementsFinancialAssetsandLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_fc61b340-9a84-4403-9136-855ca5627140" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_16cd07ae-633e-4d39-8384-f825ee6314db" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_fc61b340-9a84-4403-9136-855ca5627140" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_16cd07ae-633e-4d39-8384-f825ee6314db" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_4aee72a9-c83c-48e7-b223-86a6ed25274d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_16cd07ae-633e-4d39-8384-f825ee6314db" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_4aee72a9-c83c-48e7-b223-86a6ed25274d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_4aee72a9-c83c-48e7-b223-86a6ed25274d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_4aee72a9-c83c-48e7-b223-86a6ed25274d" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_4aee72a9-c83c-48e7-b223-86a6ed25274d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_adb797a6-8f31-4df4-bd22-5666df22db6a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_4aee72a9-c83c-48e7-b223-86a6ed25274d" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_adb797a6-8f31-4df4-bd22-5666df22db6a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_08bc8a17-ccd5-4a93-9eba-114e179a24b6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_adb797a6-8f31-4df4-bd22-5666df22db6a" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_08bc8a17-ccd5-4a93-9eba-114e179a24b6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_966b6cbd-cde2-4e5b-8664-fd69894d9ea0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_16cd07ae-633e-4d39-8384-f825ee6314db" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_966b6cbd-cde2-4e5b-8664-fd69894d9ea0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_966b6cbd-cde2-4e5b-8664-fd69894d9ea0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_966b6cbd-cde2-4e5b-8664-fd69894d9ea0" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_966b6cbd-cde2-4e5b-8664-fd69894d9ea0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e09027fa-1760-45f3-ab94-cb2a30aa4c16" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_966b6cbd-cde2-4e5b-8664-fd69894d9ea0" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e09027fa-1760-45f3-ab94-cb2a30aa4c16" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_fb7145b2-49be-4c71-bc67-d6570d8dd2ad" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e09027fa-1760-45f3-ab94-cb2a30aa4c16" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_fb7145b2-49be-4c71-bc67-d6570d8dd2ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_4406ebb6-21a8-4acf-966b-4efeab2df464" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e09027fa-1760-45f3-ab94-cb2a30aa4c16" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_4406ebb6-21a8-4acf-966b-4efeab2df464" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_7b153df7-726a-4974-acb6-50d9e0f2f1bd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e09027fa-1760-45f3-ab94-cb2a30aa4c16" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_7b153df7-726a-4974-acb6-50d9e0f2f1bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_b78301eb-84fc-4469-9cc5-7f9b3f030c48" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_fc61b340-9a84-4403-9136-855ca5627140" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_b78301eb-84fc-4469-9cc5-7f9b3f030c48" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_62bcc5ee-e452-43aa-8441-856390ffa70a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_b78301eb-84fc-4469-9cc5-7f9b3f030c48" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_62bcc5ee-e452-43aa-8441-856390ffa70a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_f00c17a8-5b99-46d2-b641-9a372995fc16" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_b78301eb-84fc-4469-9cc5-7f9b3f030c48" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_f00c17a8-5b99-46d2-b641-9a372995fc16" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_a9d87b0a-40bb-42d2-bf99-1f491540d7d0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_fc61b340-9a84-4403-9136-855ca5627140" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_a9d87b0a-40bb-42d2-bf99-1f491540d7d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantsAndRightsOutstanding_2a762066-ed89-4a14-8931-5a614876dd11" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WarrantsAndRightsOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_a9d87b0a-40bb-42d2-bf99-1f491540d7d0" xlink:to="loc_us-gaap_WarrantsAndRightsOutstanding_2a762066-ed89-4a14-8931-5a614876dd11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_632128de-208f-4f26-8c90-8a4609ba5760" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_a9d87b0a-40bb-42d2-bf99-1f491540d7d0" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_632128de-208f-4f26-8c90-8a4609ba5760" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/FairValueMeasurementsChangesinFairValueofLevel3LiabilitiesDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#FairValueMeasurementsChangesinFairValueofLevel3LiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/FairValueMeasurementsChangesinFairValueofLevel3LiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_898f64eb-ab51-4f65-b20b-5112d7471742" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_d355fd9e-811e-4854-9681-95495b419f3e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_898f64eb-ab51-4f65-b20b-5112d7471742" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_d355fd9e-811e-4854-9681-95495b419f3e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_fd942c25-aa81-40e3-ad28-9101396fcb83" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_d355fd9e-811e-4854-9681-95495b419f3e" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_fd942c25-aa81-40e3-ad28-9101396fcb83" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_fd942c25-aa81-40e3-ad28-9101396fcb83_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_fd942c25-aa81-40e3-ad28-9101396fcb83" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_fd942c25-aa81-40e3-ad28-9101396fcb83_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_98f07cac-5851-4a74-bac9-48324b91886d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_fd942c25-aa81-40e3-ad28-9101396fcb83" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_98f07cac-5851-4a74-bac9-48324b91886d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ContingentLiabilityMember_1ecb8a27-991b-4c9b-84f0-970d39cfc45f" xlink:href="lpsn-20240630.xsd#lpsn_ContingentLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_98f07cac-5851-4a74-bac9-48324b91886d" xlink:to="loc_lpsn_ContingentLiabilityMember_1ecb8a27-991b-4c9b-84f0-970d39cfc45f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_LiabilityAwardsMember_e449484a-9bed-4f6e-a950-651d517632f3" xlink:href="lpsn-20240630.xsd#lpsn_LiabilityAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_98f07cac-5851-4a74-bac9-48324b91886d" xlink:to="loc_lpsn_LiabilityAwardsMember_e449484a-9bed-4f6e-a950-651d517632f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_79525bfd-a46f-46a0-8748-a406fb847db5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_898f64eb-ab51-4f65-b20b-5112d7471742" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_79525bfd-a46f-46a0-8748-a406fb847db5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_ad80e55b-b7f8-42ec-9d05-bf4c3d63462a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_79525bfd-a46f-46a0-8748-a406fb847db5" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_ad80e55b-b7f8-42ec-9d05-bf4c3d63462a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease_79aa4284-7041-4f9d-8e9a-ca0a0bc6ee5e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_79525bfd-a46f-46a0-8748-a406fb847db5" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease_79aa4284-7041-4f9d-8e9a-ca0a0bc6ee5e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_07d804fb-9806-4c1a-b487-909b9311522b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_79525bfd-a46f-46a0-8748-a406fb847db5" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_07d804fb-9806-4c1a-b487-909b9311522b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisIssuanceOfWarrants_8fdb6629-df6f-4db1-a6b5-832726892c53" xlink:href="lpsn-20240630.xsd#lpsn_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisIssuanceOfWarrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_79525bfd-a46f-46a0-8748-a406fb847db5" xlink:to="loc_lpsn_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisIssuanceOfWarrants_8fdb6629-df6f-4db1-a6b5-832726892c53" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_b8375288-63a6-4b7c-8a68-210f70838f9e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/FairValueMeasurementsNarrativeDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#FairValueMeasurementsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/FairValueMeasurementsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_778a5dee-4cca-4d60-8b68-1cc5f0fff0e3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_5c35cadb-07cf-469f-9898-0e122130455d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_778a5dee-4cca-4d60-8b68-1cc5f0fff0e3" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_5c35cadb-07cf-469f-9898-0e122130455d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_c125d2eb-1b0b-451e-b77e-e75162eb6c6b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_5c35cadb-07cf-469f-9898-0e122130455d" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_c125d2eb-1b0b-451e-b77e-e75162eb6c6b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c125d2eb-1b0b-451e-b77e-e75162eb6c6b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_c125d2eb-1b0b-451e-b77e-e75162eb6c6b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c125d2eb-1b0b-451e-b77e-e75162eb6c6b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f6e8dbee-8da1-489f-a753-ff138c11a98b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_c125d2eb-1b0b-451e-b77e-e75162eb6c6b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f6e8dbee-8da1-489f-a753-ff138c11a98b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_WildHealthMember_8d04982b-ea65-4824-8bcd-d871bb811d34" xlink:href="lpsn-20240630.xsd#lpsn_WildHealthMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f6e8dbee-8da1-489f-a753-ff138c11a98b" xlink:to="loc_lpsn_WildHealthMember_8d04982b-ea65-4824-8bcd-d871bb811d34" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_VoiceBaseIncMember_9f863687-aff9-4cb5-9d78-dbc9dd388bd5" xlink:href="lpsn-20240630.xsd#lpsn_VoiceBaseIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f6e8dbee-8da1-489f-a753-ff138c11a98b" xlink:to="loc_lpsn_VoiceBaseIncMember_9f863687-aff9-4cb5-9d78-dbc9dd388bd5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_TenfoldMember_5ebf6e84-cbb4-4f52-8fca-47103436aee7" xlink:href="lpsn-20240630.xsd#lpsn_TenfoldMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f6e8dbee-8da1-489f-a753-ff138c11a98b" xlink:to="loc_lpsn_TenfoldMember_5ebf6e84-cbb4-4f52-8fca-47103436aee7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_Ebot7Member_b8faca72-612b-441c-ba75-6a7a138c5644" xlink:href="lpsn-20240630.xsd#lpsn_Ebot7Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f6e8dbee-8da1-489f-a753-ff138c11a98b" xlink:to="loc_lpsn_Ebot7Member_b8faca72-612b-441c-ba75-6a7a138c5644" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForPreviousAcquisition_d9f24a13-551b-4bb4-8a1b-7a36b9bfc0d4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsForPreviousAcquisition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_778a5dee-4cca-4d60-8b68-1cc5f0fff0e3" xlink:to="loc_us-gaap_PaymentsForPreviousAcquisition_d9f24a13-551b-4bb4-8a1b-7a36b9bfc0d4" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/FairValueMeasurementsScheduleofCarryingValueandFairValueofDebtInstrumentsDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#FairValueMeasurementsScheduleofCarryingValueandFairValueofDebtInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/FairValueMeasurementsScheduleofCarryingValueandFairValueofDebtInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_328cab85-60d7-46e3-b072-71c3e76b654d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_dbbf9da1-f6d7-48a8-be3a-2f62e0d25e7e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_328cab85-60d7-46e3-b072-71c3e76b654d" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_dbbf9da1-f6d7-48a8-be3a-2f62e0d25e7e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_b4119d89-d255-499e-807b-7313c9bdb8de" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_dbbf9da1-f6d7-48a8-be3a-2f62e0d25e7e" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_b4119d89-d255-499e-807b-7313c9bdb8de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_b4119d89-d255-499e-807b-7313c9bdb8de_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_b4119d89-d255-499e-807b-7313c9bdb8de" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_b4119d89-d255-499e-807b-7313c9bdb8de_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1e50bd16-5df2-490a-af85-f9bb7e9a444d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_b4119d89-d255-499e-807b-7313c9bdb8de" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1e50bd16-5df2-490a-af85-f9bb7e9a444d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_d430c16d-0430-4da0-8067-d0856ea393b4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1e50bd16-5df2-490a-af85-f9bb7e9a444d" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_d430c16d-0430-4da0-8067-d0856ea393b4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_7a68a8fc-0571-4539-8911-b59f1c22270c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_dbbf9da1-f6d7-48a8-be3a-2f62e0d25e7e" xlink:to="loc_us-gaap_DebtInstrumentAxis_7a68a8fc-0571-4539-8911-b59f1c22270c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_7a68a8fc-0571-4539-8911-b59f1c22270c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_7a68a8fc-0571-4539-8911-b59f1c22270c" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_7a68a8fc-0571-4539-8911-b59f1c22270c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_0311d9eb-5fec-46b4-957c-02a7cffc94b4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_7a68a8fc-0571-4539-8911-b59f1c22270c" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_0311d9eb-5fec-46b4-957c-02a7cffc94b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesDue2026Member_dee7f07c-0a0d-420d-ac4f-5701ec558c69" xlink:href="lpsn-20240630.xsd#lpsn_ConvertibleSeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0311d9eb-5fec-46b4-957c-02a7cffc94b4" xlink:to="loc_lpsn_ConvertibleSeniorNotesDue2026Member_dee7f07c-0a0d-420d-ac4f-5701ec558c69" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesDue2029Member_c894dfc7-a733-41f6-a7ef-a90f6cdc2b6d" xlink:href="lpsn-20240630.xsd#lpsn_ConvertibleSeniorNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0311d9eb-5fec-46b4-957c-02a7cffc94b4" xlink:to="loc_lpsn_ConvertibleSeniorNotesDue2029Member_c894dfc7-a733-41f6-a7ef-a90f6cdc2b6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesDue2024Member_c18f0836-4408-4af0-8d7c-4d233485c2a0" xlink:href="lpsn-20240630.xsd#lpsn_ConvertibleSeniorNotesDue2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0311d9eb-5fec-46b4-957c-02a7cffc94b4" xlink:to="loc_lpsn_ConvertibleSeniorNotesDue2024Member_c18f0836-4408-4af0-8d7c-4d233485c2a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtFairValueDisclosures_c4b5a18b-433c-4678-8968-15649cd115bf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleDebtFairValueDisclosures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_328cab85-60d7-46e3-b072-71c3e76b654d" xlink:to="loc_us-gaap_ConvertibleDebtFairValueDisclosures_c4b5a18b-433c-4678-8968-15649cd115bf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_136d8ab0-4842-4686-95dc-fcda464255ec" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_328cab85-60d7-46e3-b072-71c3e76b654d" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_136d8ab0-4842-4686-95dc-fcda464255ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_aa0f866f-62de-4cf2-8862-42bd6e8dfeb0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentUnamortizedDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_328cab85-60d7-46e3-b072-71c3e76b654d" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_aa0f866f-62de-4cf2-8862-42bd6e8dfeb0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnamortizedDebtIssuanceExpense_2a8e2268-5c1b-4421-b614-7a989076d793" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnamortizedDebtIssuanceExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_328cab85-60d7-46e3-b072-71c3e76b654d" xlink:to="loc_us-gaap_UnamortizedDebtIssuanceExpense_2a8e2268-5c1b-4421-b614-7a989076d793" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent_be8ee60d-9a5a-42bd-8e18-a623ee7ed544" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_328cab85-60d7-46e3-b072-71c3e76b654d" xlink:to="loc_us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent_be8ee60d-9a5a-42bd-8e18-a623ee7ed544" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/FairValueMeasurementsPricingModelAssumptionsDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#FairValueMeasurementsPricingModelAssumptionsDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/FairValueMeasurementsPricingModelAssumptionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_9952b835-396b-40a9-afe7-732467425139" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_06d64541-d2af-427c-9d6d-c502454833e1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_9952b835-396b-40a9-afe7-732467425139" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_06d64541-d2af-427c-9d6d-c502454833e1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_b128a309-6e78-4d48-99f8-b6b4b87c67d7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_06d64541-d2af-427c-9d6d-c502454833e1" xlink:to="loc_us-gaap_AwardTypeAxis_b128a309-6e78-4d48-99f8-b6b4b87c67d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b128a309-6e78-4d48-99f8-b6b4b87c67d7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_b128a309-6e78-4d48-99f8-b6b4b87c67d7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b128a309-6e78-4d48-99f8-b6b4b87c67d7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b5c4d159-8147-4525-b2da-4fe72a2e040b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_b128a309-6e78-4d48-99f8-b6b4b87c67d7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b5c4d159-8147-4525-b2da-4fe72a2e040b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember_104772e1-9313-4fb9-ae10-e78a5cd2d328" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WarrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b5c4d159-8147-4525-b2da-4fe72a2e040b" xlink:to="loc_us-gaap_WarrantMember_104772e1-9313-4fb9-ae10-e78a5cd2d328" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice_024bad5e-3042-4424-8dde-e8a2ff291b0e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_9952b835-396b-40a9-afe7-732467425139" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice_024bad5e-3042-4424-8dde-e8a2ff291b0e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_06b1b802-d293-45b1-ac22-8fb5033a7109" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_9952b835-396b-40a9-afe7-732467425139" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_06b1b802-d293-45b1-ac22-8fb5033a7109" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_dff61d3a-74c0-40cd-8c39-f8eafc8477b3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_9952b835-396b-40a9-afe7-732467425139" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_dff61d3a-74c0-40cd-8c39-f8eafc8477b3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_fd7738b5-ebf5-4489-a871-ead875a77636" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_9952b835-396b-40a9-afe7-732467425139" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_fd7738b5-ebf5-4489-a871-ead875a77636" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#CommitmentsandContingenciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsLineItems_73594b81-e462-4bdc-99e8-bf917d3b6ffa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsTable_41aba5a8-f9c1-4aad-9b86-010c6abf0bb4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_73594b81-e462-4bdc-99e8-bf917d3b6ffa" xlink:to="loc_us-gaap_OtherCommitmentsTable_41aba5a8-f9c1-4aad-9b86-010c6abf0bb4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DefinedContributionPlanMatchGroupsAxis_7a2822f2-4c79-4c58-ba00-2aacfc3d877f" xlink:href="lpsn-20240630.xsd#lpsn_DefinedContributionPlanMatchGroupsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_41aba5a8-f9c1-4aad-9b86-010c6abf0bb4" xlink:to="loc_lpsn_DefinedContributionPlanMatchGroupsAxis_7a2822f2-4c79-4c58-ba00-2aacfc3d877f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DefinedContributionPlanMatchGroupsDomain_7a2822f2-4c79-4c58-ba00-2aacfc3d877f_default" xlink:href="lpsn-20240630.xsd#lpsn_DefinedContributionPlanMatchGroupsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_lpsn_DefinedContributionPlanMatchGroupsAxis_7a2822f2-4c79-4c58-ba00-2aacfc3d877f" xlink:to="loc_lpsn_DefinedContributionPlanMatchGroupsDomain_7a2822f2-4c79-4c58-ba00-2aacfc3d877f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DefinedContributionPlanMatchGroupsDomain_012fdf8b-9129-45a0-a648-a01be6e3d6cc" xlink:href="lpsn-20240630.xsd#lpsn_DefinedContributionPlanMatchGroupsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_lpsn_DefinedContributionPlanMatchGroupsAxis_7a2822f2-4c79-4c58-ba00-2aacfc3d877f" xlink:to="loc_lpsn_DefinedContributionPlanMatchGroupsDomain_012fdf8b-9129-45a0-a648-a01be6e3d6cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_MatchingTrancheOneMember_712dc20c-861b-40f3-9076-924ae0cdc1d2" xlink:href="lpsn-20240630.xsd#lpsn_MatchingTrancheOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_DefinedContributionPlanMatchGroupsDomain_012fdf8b-9129-45a0-a648-a01be6e3d6cc" xlink:to="loc_lpsn_MatchingTrancheOneMember_712dc20c-861b-40f3-9076-924ae0cdc1d2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_MatchingTrancheTwoMember_110abb3e-15db-4432-849e-a8ea8f43ce65" xlink:href="lpsn-20240630.xsd#lpsn_MatchingTrancheTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_DefinedContributionPlanMatchGroupsDomain_012fdf8b-9129-45a0-a648-a01be6e3d6cc" xlink:to="loc_lpsn_MatchingTrancheTwoMember_110abb3e-15db-4432-849e-a8ea8f43ce65" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_14f8466e-2e0e-476d-b6b0-9a2276cf8c6f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_41aba5a8-f9c1-4aad-9b86-010c6abf0bb4" xlink:to="loc_us-gaap_CreditFacilityAxis_14f8466e-2e0e-476d-b6b0-9a2276cf8c6f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_14f8466e-2e0e-476d-b6b0-9a2276cf8c6f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_14f8466e-2e0e-476d-b6b0-9a2276cf8c6f" xlink:to="loc_us-gaap_CreditFacilityDomain_14f8466e-2e0e-476d-b6b0-9a2276cf8c6f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_6eeebcca-0c3e-460c-b11b-0149784f7601" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_14f8466e-2e0e-476d-b6b0-9a2276cf8c6f" xlink:to="loc_us-gaap_CreditFacilityDomain_6eeebcca-0c3e-460c-b11b-0149784f7601" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_c04df165-9f7a-42ef-a6cc-3b85849f6f63" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_6eeebcca-0c3e-460c-b11b-0149784f7601" xlink:to="loc_us-gaap_LetterOfCreditMember_c04df165-9f7a-42ef-a6cc-3b85849f6f63" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_52fd13b6-20f6-4663-9ca5-520882fa2136" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_41aba5a8-f9c1-4aad-9b86-010c6abf0bb4" xlink:to="loc_us-gaap_DebtInstrumentAxis_52fd13b6-20f6-4663-9ca5-520882fa2136" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_52fd13b6-20f6-4663-9ca5-520882fa2136_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_52fd13b6-20f6-4663-9ca5-520882fa2136" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_52fd13b6-20f6-4663-9ca5-520882fa2136_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_284fd707-a1d4-4130-a616-efac0dbe3cb7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_52fd13b6-20f6-4663-9ca5-520882fa2136" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_284fd707-a1d4-4130-a616-efac0dbe3cb7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_LetterOfCreditForSecurityDepositMember_a72182be-9574-45fa-ab70-65570f17be21" xlink:href="lpsn-20240630.xsd#lpsn_LetterOfCreditForSecurityDepositMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_284fd707-a1d4-4130-a616-efac0dbe3cb7" xlink:to="loc_lpsn_LetterOfCreditForSecurityDepositMember_a72182be-9574-45fa-ab70-65570f17be21" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch_d440d463-60b7-4b08-a34a-7487f9117528" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_73594b81-e462-4bdc-99e8-bf917d3b6ffa" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch_d440d463-60b7-4b08-a34a-7487f9117528" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_6c97d8e3-dff7-472c-9f8f-a015f8145e02" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_73594b81-e462-4bdc-99e8-bf917d3b6ffa" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_6c97d8e3-dff7-472c-9f8f-a015f8145e02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_4aefa842-90be-4c3c-b1e4-7c9737866887" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_73594b81-e462-4bdc-99e8-bf917d3b6ffa" xlink:to="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_4aefa842-90be-4c3c-b1e4-7c9737866887" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_6ece06fd-6bc7-4cac-9b71-7da2b6b3d0b4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_73594b81-e462-4bdc-99e8-bf917d3b6ffa" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_6ece06fd-6bc7-4cac-9b71-7da2b6b3d0b4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermPurchaseCommitmentPeriod_5691be8d-cd4c-4edc-882e-09015878dda9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermPurchaseCommitmentPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_73594b81-e462-4bdc-99e8-bf917d3b6ffa" xlink:to="loc_us-gaap_LongtermPurchaseCommitmentPeriod_5691be8d-cd4c-4edc-882e-09015878dda9" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/StockholdersEquitySummaryofRestrictedStockUnitActivityandWeightedAverageExercisePriceDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#StockholdersEquitySummaryofRestrictedStockUnitActivityandWeightedAverageExercisePriceDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/StockholdersEquitySummaryofRestrictedStockUnitActivityandWeightedAverageExercisePriceDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ffd51f96-54ba-4b1e-a1e7-b19866318919" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1a49059a-b327-4bc0-a074-2ca863f86384" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ffd51f96-54ba-4b1e-a1e7-b19866318919" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1a49059a-b327-4bc0-a074-2ca863f86384" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_f357715a-dccd-43d9-8a40-d513e7270272" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1a49059a-b327-4bc0-a074-2ca863f86384" xlink:to="loc_us-gaap_AwardTypeAxis_f357715a-dccd-43d9-8a40-d513e7270272" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f357715a-dccd-43d9-8a40-d513e7270272_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_f357715a-dccd-43d9-8a40-d513e7270272" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f357715a-dccd-43d9-8a40-d513e7270272_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bbc9d673-457c-4c8e-90b9-9970a24c75ca" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_f357715a-dccd-43d9-8a40-d513e7270272" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bbc9d673-457c-4c8e-90b9-9970a24c75ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_9238c72b-b265-46a9-a495-fd88a2251be1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bbc9d673-457c-4c8e-90b9-9970a24c75ca" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_9238c72b-b265-46a9-a495-fd88a2251be1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_39529685-62df-4417-8719-6955fce9e11b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ffd51f96-54ba-4b1e-a1e7-b19866318919" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_39529685-62df-4417-8719-6955fce9e11b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_4c2b8d2a-df5e-4d64-9d1d-37be3e0a8fd0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_39529685-62df-4417-8719-6955fce9e11b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_4c2b8d2a-df5e-4d64-9d1d-37be3e0a8fd0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted_c4535df4-ef90-4aa8-a579-f405db2fe341" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_39529685-62df-4417-8719-6955fce9e11b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted_c4535df4-ef90-4aa8-a579-f405db2fe341" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_aba41087-19ef-42ca-a44e-2eca9607c7d4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_39529685-62df-4417-8719-6955fce9e11b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_aba41087-19ef-42ca-a44e-2eca9607c7d4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures_95b8d025-5ccf-4afe-ba52-5a06c702548f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_39529685-62df-4417-8719-6955fce9e11b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures_95b8d025-5ccf-4afe-ba52-5a06c702548f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_9ecb6ab3-eabd-4204-af98-de488927c4c6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpectedToVest_1713330b-af69-4361-8680-79c86b9677e2" xlink:href="lpsn-20240630.xsd#lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpectedToVest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_39529685-62df-4417-8719-6955fce9e11b" xlink:to="loc_lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpectedToVest_1713330b-af69-4361-8680-79c86b9677e2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageGrantDateFairValueAbstractRollForward_ce7e3f30-06be-4a7b-afbc-05a026400299" xlink:href="lpsn-20240630.xsd#lpsn_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageGrantDateFairValueAbstractRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ffd51f96-54ba-4b1e-a1e7-b19866318919" xlink:to="loc_lpsn_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageGrantDateFairValueAbstractRollForward_ce7e3f30-06be-4a7b-afbc-05a026400299" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_b1f20cff-d37a-4223-bd02-e130f5b947d3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageGrantDateFairValueAbstractRollForward_ce7e3f30-06be-4a7b-afbc-05a026400299" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_b1f20cff-d37a-4223-bd02-e130f5b947d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_8ae7a382-9907-4772-b54a-c8cb456a4650" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageGrantDateFairValueAbstractRollForward_ce7e3f30-06be-4a7b-afbc-05a026400299" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_8ae7a382-9907-4772-b54a-c8cb456a4650" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_dc1f871a-2a6a-487e-9702-db94935bd837" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageGrantDateFairValueAbstractRollForward_ce7e3f30-06be-4a7b-afbc-05a026400299" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_dc1f871a-2a6a-487e-9702-db94935bd837" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_032c6698-2852-4e4b-bfe0-081b7871ab57" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageGrantDateFairValueAbstractRollForward_ce7e3f30-06be-4a7b-afbc-05a026400299" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_032c6698-2852-4e4b-bfe0-081b7871ab57" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_a0a0453a-477b-4581-98a9-53426c81b728" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpectedToVestWeightedAverageGrantDateFairValue_eb38bf63-812f-43fb-b3f4-2a8d700b098e" xlink:href="lpsn-20240630.xsd#lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpectedToVestWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageGrantDateFairValueAbstractRollForward_ce7e3f30-06be-4a7b-afbc-05a026400299" xlink:to="loc_lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpectedToVestWeightedAverageGrantDateFairValue_eb38bf63-812f-43fb-b3f4-2a8d700b098e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsAggregateIntrinsicValueRollForward_2eb75daf-9b8a-4234-8712-25741388b070" xlink:href="lpsn-20240630.xsd#lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsAggregateIntrinsicValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ffd51f96-54ba-4b1e-a1e7-b19866318919" xlink:to="loc_lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsAggregateIntrinsicValueRollForward_2eb75daf-9b8a-4234-8712-25741388b070" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsAggregateIntrinsicValueNonvestedAndOutstanding_445c62e3-d914-4752-b720-fca4d8ba1c84" xlink:href="lpsn-20240630.xsd#lpsn_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsAggregateIntrinsicValueNonvestedAndOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsAggregateIntrinsicValueRollForward_2eb75daf-9b8a-4234-8712-25741388b070" xlink:to="loc_lpsn_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsAggregateIntrinsicValueNonvestedAndOutstanding_445c62e3-d914-4752-b720-fca4d8ba1c84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsAggregateIntrinsicValueExpectedToVest_3bb7388b-2041-4934-b31e-9e03f8584327" xlink:href="lpsn-20240630.xsd#lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsAggregateIntrinsicValueExpectedToVest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsAggregateIntrinsicValueRollForward_2eb75daf-9b8a-4234-8712-25741388b070" xlink:to="loc_lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsAggregateIntrinsicValueExpectedToVest_3bb7388b-2041-4934-b31e-9e03f8584327" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/StockholdersEquityNarrativeDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#StockholdersEquityNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/StockholdersEquityNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_47431389-37f9-480b-9cab-1ee0383287be" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_a8b316c4-ef79-4065-b997-dd9e5ca4fd2a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_47431389-37f9-480b-9cab-1ee0383287be" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_a8b316c4-ef79-4065-b997-dd9e5ca4fd2a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_7dcc1520-c160-42e5-8026-08b833c413f2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_a8b316c4-ef79-4065-b997-dd9e5ca4fd2a" xlink:to="loc_us-gaap_AwardTypeAxis_7dcc1520-c160-42e5-8026-08b833c413f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7dcc1520-c160-42e5-8026-08b833c413f2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_7dcc1520-c160-42e5-8026-08b833c413f2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7dcc1520-c160-42e5-8026-08b833c413f2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c0891164-356a-44f8-870e-2dc6b8a9f8b7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_7dcc1520-c160-42e5-8026-08b833c413f2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c0891164-356a-44f8-870e-2dc6b8a9f8b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_a668a254-79c1-4385-af3c-d66786dd2026" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c0891164-356a-44f8-870e-2dc6b8a9f8b7" xlink:to="loc_us-gaap_EmployeeStockOptionMember_a668a254-79c1-4385-af3c-d66786dd2026" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_EmployeeStockPurchasePlanMember_2bd97b3f-0dea-4bd6-aa22-917e70c8ac42" xlink:href="lpsn-20240630.xsd#lpsn_EmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c0891164-356a-44f8-870e-2dc6b8a9f8b7" xlink:to="loc_lpsn_EmployeeStockPurchasePlanMember_2bd97b3f-0dea-4bd6-aa22-917e70c8ac42" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_IncentiveStockOptionMember_c4715586-c113-416e-8a54-ff2d65321027" xlink:href="lpsn-20240630.xsd#lpsn_IncentiveStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c0891164-356a-44f8-870e-2dc6b8a9f8b7" xlink:to="loc_lpsn_IncentiveStockOptionMember_c4715586-c113-416e-8a54-ff2d65321027" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_26a1b6e8-b605-4910-ae6f-f347ad3df9c6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c0891164-356a-44f8-870e-2dc6b8a9f8b7" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_26a1b6e8-b605-4910-ae6f-f347ad3df9c6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_CEOInducementAwardMember_e387228e-e003-4beb-b277-9a696720aa81" xlink:href="lpsn-20240630.xsd#lpsn_CEOInducementAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c0891164-356a-44f8-870e-2dc6b8a9f8b7" xlink:to="loc_lpsn_CEOInducementAwardMember_e387228e-e003-4beb-b277-9a696720aa81" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_8e274741-fc94-4354-8968-ca2d325def02" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_a8b316c4-ef79-4065-b997-dd9e5ca4fd2a" xlink:to="loc_us-gaap_PlanNameAxis_8e274741-fc94-4354-8968-ca2d325def02" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_8e274741-fc94-4354-8968-ca2d325def02_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_8e274741-fc94-4354-8968-ca2d325def02" xlink:to="loc_us-gaap_PlanNameDomain_8e274741-fc94-4354-8968-ca2d325def02_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_a3300055-0dbd-4afb-b37e-f69598de8708" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_8e274741-fc94-4354-8968-ca2d325def02" xlink:to="loc_us-gaap_PlanNameDomain_a3300055-0dbd-4afb-b37e-f69598de8708" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_A2019StockIncentivePlanMember_72c83aad-1ee3-4e31-941a-32e30ca87ccd" xlink:href="lpsn-20240630.xsd#lpsn_A2019StockIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_a3300055-0dbd-4afb-b37e-f69598de8708" xlink:to="loc_lpsn_A2019StockIncentivePlanMember_72c83aad-1ee3-4e31-941a-32e30ca87ccd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_e3e0609f-7581-4b62-8b7f-beda1f9f0c54" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_a8b316c4-ef79-4065-b997-dd9e5ca4fd2a" xlink:to="loc_srt_RangeAxis_e3e0609f-7581-4b62-8b7f-beda1f9f0c54" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e3e0609f-7581-4b62-8b7f-beda1f9f0c54_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_e3e0609f-7581-4b62-8b7f-beda1f9f0c54" xlink:to="loc_srt_RangeMember_e3e0609f-7581-4b62-8b7f-beda1f9f0c54_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_a91697e6-1034-4b18-b598-e2a7fdc46845" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_e3e0609f-7581-4b62-8b7f-beda1f9f0c54" xlink:to="loc_srt_RangeMember_a91697e6-1034-4b18-b598-e2a7fdc46845" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_acab3de9-c2d8-4c23-8059-649f09666025" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_a91697e6-1034-4b18-b598-e2a7fdc46845" xlink:to="loc_srt_MinimumMember_acab3de9-c2d8-4c23-8059-649f09666025" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_e0407e58-44dc-4ff8-b4a1-f39ed24c60be" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_a91697e6-1034-4b18-b598-e2a7fdc46845" xlink:to="loc_srt_MaximumMember_e0407e58-44dc-4ff8-b4a1-f39ed24c60be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_cc6d2248-2b76-423b-9181-02f9ff3c8eb8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_47431389-37f9-480b-9cab-1ee0383287be" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_cc6d2248-2b76-423b-9181-02f9ff3c8eb8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_17f0b5ec-30cc-4027-ae54-1ae3aed3c6c1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_47431389-37f9-480b-9cab-1ee0383287be" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_17f0b5ec-30cc-4027-ae54-1ae3aed3c6c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_47d9bcc4-4089-418f-9e6e-2d03743b9870" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_47431389-37f9-480b-9cab-1ee0383287be" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_47d9bcc4-4089-418f-9e6e-2d03743b9870" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_1fa57536-c47c-488a-a973-ebc1be549721" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_47431389-37f9-480b-9cab-1ee0383287be" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_1fa57536-c47c-488a-a973-ebc1be549721" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_72844d4b-4902-4741-a24b-799b35d42ab5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_47431389-37f9-480b-9cab-1ee0383287be" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_72844d4b-4902-4741-a24b-799b35d42ab5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_a6d8bcef-caa9-4b3c-99ed-ea8066ed7df9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_47431389-37f9-480b-9cab-1ee0383287be" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_a6d8bcef-caa9-4b3c-99ed-ea8066ed7df9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_62f46788-5960-4a10-9706-bafef4408c07" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_47431389-37f9-480b-9cab-1ee0383287be" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_62f46788-5960-4a10-9706-bafef4408c07" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance_d8094bd7-ecc9-414a-b77d-cedd72141d09" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_47431389-37f9-480b-9cab-1ee0383287be" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance_d8094bd7-ecc9-414a-b77d-cedd72141d09" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/StockholdersEquityScheduleofStockBasedCompensationCostsDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#StockholdersEquityScheduleofStockBasedCompensationCostsDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/StockholdersEquityScheduleofStockBasedCompensationCostsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_27315c4e-949e-4101-8259-b9f1adca4826" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_304d6b51-ae03-4c7d-bd26-e9e7b6647ee6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_27315c4e-949e-4101-8259-b9f1adca4826" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_304d6b51-ae03-4c7d-bd26-e9e7b6647ee6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_35756a38-0769-469b-8e9b-d17ab8b41be8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_304d6b51-ae03-4c7d-bd26-e9e7b6647ee6" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_35756a38-0769-469b-8e9b-d17ab8b41be8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_35756a38-0769-469b-8e9b-d17ab8b41be8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_35756a38-0769-469b-8e9b-d17ab8b41be8" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_35756a38-0769-469b-8e9b-d17ab8b41be8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_aa38316f-bae2-4742-a90e-ed03cfe8a837" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_35756a38-0769-469b-8e9b-d17ab8b41be8" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_aa38316f-bae2-4742-a90e-ed03cfe8a837" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_040f1b94-976e-4922-86e1-1dd051d3dbeb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_aa38316f-bae2-4742-a90e-ed03cfe8a837" xlink:to="loc_us-gaap_CostOfSalesMember_040f1b94-976e-4922-86e1-1dd051d3dbeb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_efa8aed2-3d8c-4b9c-ad5a-e712fbbfb5db" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SellingAndMarketingExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_aa38316f-bae2-4742-a90e-ed03cfe8a837" xlink:to="loc_us-gaap_SellingAndMarketingExpenseMember_efa8aed2-3d8c-4b9c-ad5a-e712fbbfb5db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_2281140e-edda-4ea3-a7ee-87a110f0fcb4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GeneralAndAdministrativeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_aa38316f-bae2-4742-a90e-ed03cfe8a837" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_2281140e-edda-4ea3-a7ee-87a110f0fcb4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_1ad7dbfe-7b71-468d-8ed3-fc409d5813fb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_aa38316f-bae2-4742-a90e-ed03cfe8a837" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_1ad7dbfe-7b71-468d-8ed3-fc409d5813fb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_bbe49bc3-fc9f-440c-8e65-b75dedc14ed7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_27315c4e-949e-4101-8259-b9f1adca4826" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_bbe49bc3-fc9f-440c-8e65-b75dedc14ed7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/RestructuringScheduleofRestructuringLiabilitybyCostTypeDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#RestructuringScheduleofRestructuringLiabilitybyCostTypeDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/RestructuringScheduleofRestructuringLiabilitybyCostTypeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_75a79d70-454a-411a-826c-adf9e993d77d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_62b1075f-cc31-4e9d-a2f2-74f479b74ca1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_75a79d70-454a-411a-826c-adf9e993d77d" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_62b1075f-cc31-4e9d-a2f2-74f479b74ca1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_39838723-218d-4fa1-915f-acf54f6b20db" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_62b1075f-cc31-4e9d-a2f2-74f479b74ca1" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_39838723-218d-4fa1-915f-acf54f6b20db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_39838723-218d-4fa1-915f-acf54f6b20db_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_39838723-218d-4fa1-915f-acf54f6b20db" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_39838723-218d-4fa1-915f-acf54f6b20db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_60126775-d75d-436e-8cf0-70dbcdd5d629" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_39838723-218d-4fa1-915f-acf54f6b20db" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_60126775-d75d-436e-8cf0-70dbcdd5d629" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractTerminationMember_0440105d-e2eb-4266-b718-45e6e3a7a658" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ContractTerminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_60126775-d75d-436e-8cf0-70dbcdd5d629" xlink:to="loc_us-gaap_ContractTerminationMember_0440105d-e2eb-4266-b718-45e6e3a7a658" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_19f3a1f1-914a-4d98-92ec-dcd3e3358d9c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_60126775-d75d-436e-8cf0-70dbcdd5d629" xlink:to="loc_us-gaap_EmployeeSeveranceMember_19f3a1f1-914a-4d98-92ec-dcd3e3358d9c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_c46e9c15-8384-48f7-9319-a1cc8e32002d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_75a79d70-454a-411a-826c-adf9e993d77d" xlink:to="loc_us-gaap_RestructuringCharges_c46e9c15-8384-48f7-9319-a1cc8e32002d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/LegalMattersDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#LegalMattersDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/LegalMattersDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_e4dbb38f-01d7-48b9-9e86-1d11d50ac5e2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_441ce033-b80e-4cd8-8970-d88b885875bb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_e4dbb38f-01d7-48b9-9e86-1d11d50ac5e2" xlink:to="loc_us-gaap_LossContingenciesTable_441ce033-b80e-4cd8-8970-d88b885875bb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_1b18ff53-607e-4082-b287-cffda298723b" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_441ce033-b80e-4cd8-8970-d88b885875bb" xlink:to="loc_srt_LitigationCaseAxis_1b18ff53-607e-4082-b287-cffda298723b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_1b18ff53-607e-4082-b287-cffda298723b_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_1b18ff53-607e-4082-b287-cffda298723b" xlink:to="loc_srt_LitigationCaseTypeDomain_1b18ff53-607e-4082-b287-cffda298723b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_7fa6913a-85ea-49bb-acef-5ee870237e3d" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_1b18ff53-607e-4082-b287-cffda298723b" xlink:to="loc_srt_LitigationCaseTypeDomain_7fa6913a-85ea-49bb-acef-5ee870237e3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_BrownV.LayfieldMember_eb49eedd-ca5c-4c13-85a8-9fae3c03e9a0" xlink:href="lpsn-20240630.xsd#lpsn_BrownV.LayfieldMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_7fa6913a-85ea-49bb-acef-5ee870237e3d" xlink:to="loc_lpsn_BrownV.LayfieldMember_eb49eedd-ca5c-4c13-85a8-9fae3c03e9a0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyDamagesSoughtValue_064c2fc0-400d-4150-a2bb-383ad8ed2755" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LossContingencyDamagesSoughtValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_e4dbb38f-01d7-48b9-9e86-1d11d50ac5e2" xlink:to="loc_us-gaap_LossContingencyDamagesSoughtValue_064c2fc0-400d-4150-a2bb-383ad8ed2755" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/IncomeTaxesDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#IncomeTaxesDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/IncomeTaxesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxContingencyLineItems_a55aa252-fb0b-4e93-a61d-26e083b0fafc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxContingencyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxContingencyTable_f2d3be08-38fd-4f28-96e7-93efae5968f3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxContingencyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_a55aa252-fb0b-4e93-a61d-26e083b0fafc" xlink:to="loc_us-gaap_IncomeTaxContingencyTable_f2d3be08-38fd-4f28-96e7-93efae5968f3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_5d2c6e47-44a5-4f96-9078-13c7abe61fc5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_f2d3be08-38fd-4f28-96e7-93efae5968f3" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_5d2c6e47-44a5-4f96-9078-13c7abe61fc5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_5d2c6e47-44a5-4f96-9078-13c7abe61fc5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_5d2c6e47-44a5-4f96-9078-13c7abe61fc5" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_5d2c6e47-44a5-4f96-9078-13c7abe61fc5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_8134ca52-5bd5-4fb3-adc7-b3021fedcdfd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_5d2c6e47-44a5-4f96-9078-13c7abe61fc5" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_8134ca52-5bd5-4fb3-adc7-b3021fedcdfd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_e9f90633-f6a4-4305-ae6b-75b3df2b9d65" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ForeignCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_8134ca52-5bd5-4fb3-adc7-b3021fedcdfd" xlink:to="loc_us-gaap_ForeignCountryMember_e9f90633-f6a4-4305-ae6b-75b3df2b9d65" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_bab5b759-1aaa-4cfc-82eb-3b38fd8b8af5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_f2d3be08-38fd-4f28-96e7-93efae5968f3" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_bab5b759-1aaa-4cfc-82eb-3b38fd8b8af5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_bab5b759-1aaa-4cfc-82eb-3b38fd8b8af5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TypeOfAdoptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_bab5b759-1aaa-4cfc-82eb-3b38fd8b8af5" xlink:to="loc_us-gaap_TypeOfAdoptionMember_bab5b759-1aaa-4cfc-82eb-3b38fd8b8af5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_ee8ee04f-914c-4305-a071-44c6b79dfeb6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TypeOfAdoptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_bab5b759-1aaa-4cfc-82eb-3b38fd8b8af5" xlink:to="loc_us-gaap_TypeOfAdoptionMember_ee8ee04f-914c-4305-a071-44c6b79dfeb6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingStandardsUpdate202006Member_df91870a-adcb-4fb8-b1b0-b34e2a91b8be" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountingStandardsUpdate202006Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_ee8ee04f-914c-4305-a071-44c6b79dfeb6" xlink:to="loc_us-gaap_AccountingStandardsUpdate202006Member_df91870a-adcb-4fb8-b1b0-b34e2a91b8be" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_2df34555-a086-49f7-828a-e1f19f914288" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_a55aa252-fb0b-4e93-a61d-26e083b0fafc" xlink:to="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_2df34555-a086-49f7-828a-e1f19f914288" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_a2809fd7-ef4a-4996-9ec2-fbdbe5473d82" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_a55aa252-fb0b-4e93-a61d-26e083b0fafc" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_a2809fd7-ef4a-4996-9ec2-fbdbe5473d82" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_1e68851c-8c33-4619-aa9d-333ed5887fa9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_a55aa252-fb0b-4e93-a61d-26e083b0fafc" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_1e68851c-8c33-4619-aa9d-333ed5887fa9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ValuationAllowanceDeferredTaxAssetIncreaseGross_7615cfb8-29a6-4c30-8e84-7523ee04d938" xlink:href="lpsn-20240630.xsd#lpsn_ValuationAllowanceDeferredTaxAssetIncreaseGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_a55aa252-fb0b-4e93-a61d-26e083b0fafc" xlink:to="loc_lpsn_ValuationAllowanceDeferredTaxAssetIncreaseGross_7615cfb8-29a6-4c30-8e84-7523ee04d938" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ValuationAllowanceDeferredTaxAssetDecreaseGross_fb0164cd-6b88-483e-be6a-187c839fa21b" xlink:href="lpsn-20240630.xsd#lpsn_ValuationAllowanceDeferredTaxAssetDecreaseGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_a55aa252-fb0b-4e93-a61d-26e083b0fafc" xlink:to="loc_lpsn_ValuationAllowanceDeferredTaxAssetDecreaseGross_fb0164cd-6b88-483e-be6a-187c839fa21b" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/EquityMethodInvestmentsDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#EquityMethodInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/EquityMethodInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_4e1d8703-9df8-4e55-b1ce-aa5daacc2b06" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_84c95424-0793-4c62-9bc6-031375aa54a1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_4e1d8703-9df8-4e55-b1ce-aa5daacc2b06" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_84c95424-0793-4c62-9bc6-031375aa54a1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_b65fb2b6-07f5-4f8b-b36c-edeb4063bdf5" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_84c95424-0793-4c62-9bc6-031375aa54a1" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_b65fb2b6-07f5-4f8b-b36c-edeb4063bdf5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_b65fb2b6-07f5-4f8b-b36c-edeb4063bdf5_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_b65fb2b6-07f5-4f8b-b36c-edeb4063bdf5" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_b65fb2b6-07f5-4f8b-b36c-edeb4063bdf5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_36f9d2c4-5ee7-4b27-b4f7-6eb5ac9f4bb8" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_b65fb2b6-07f5-4f8b-b36c-edeb4063bdf5" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_36f9d2c4-5ee7-4b27-b4f7-6eb5ac9f4bb8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ClaireHoldingsIncMember_f1b0891a-7437-40ae-aa68-bcbba259265e" xlink:href="lpsn-20240630.xsd#lpsn_ClaireHoldingsIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_36f9d2c4-5ee7-4b27-b4f7-6eb5ac9f4bb8" xlink:to="loc_lpsn_ClaireHoldingsIncMember_f1b0891a-7437-40ae-aa68-bcbba259265e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_78552a7a-5cb3-491d-bdd3-a14079fe33e6" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_84c95424-0793-4c62-9bc6-031375aa54a1" xlink:to="loc_srt_CounterpartyNameAxis_78552a7a-5cb3-491d-bdd3-a14079fe33e6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_78552a7a-5cb3-491d-bdd3-a14079fe33e6_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_78552a7a-5cb3-491d-bdd3-a14079fe33e6" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_78552a7a-5cb3-491d-bdd3-a14079fe33e6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_37bd63da-b7f4-4247-a48e-de825e4f10ee" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_78552a7a-5cb3-491d-bdd3-a14079fe33e6" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_37bd63da-b7f4-4247-a48e-de825e4f10ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_PasacaCapitalIncPasacaMember_eca65a81-4a9b-44f6-a5cf-69344ccd490e" xlink:href="lpsn-20240630.xsd#lpsn_PasacaCapitalIncPasacaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_37bd63da-b7f4-4247-a48e-de825e4f10ee" xlink:to="loc_lpsn_PasacaCapitalIncPasacaMember_eca65a81-4a9b-44f6-a5cf-69344ccd490e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_b66984da-f606-4b9c-926c-1df05d0d571c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsToAcquireEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_4e1d8703-9df8-4e55-b1ce-aa5daacc2b06" xlink:to="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_b66984da-f606-4b9c-926c-1df05d0d571c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_EquityMethodInvestmentContributionTerm_d60419b4-bafb-4f06-a38d-03dbf478f0da" xlink:href="lpsn-20240630.xsd#lpsn_EquityMethodInvestmentContributionTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_4e1d8703-9df8-4e55-b1ce-aa5daacc2b06" xlink:to="loc_lpsn_EquityMethodInvestmentContributionTerm_d60419b4-bafb-4f06-a38d-03dbf478f0da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_8b9daee7-a660-4989-8a56-4b59f55db432" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_4e1d8703-9df8-4e55-b1ce-aa5daacc2b06" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_8b9daee7-a660-4989-8a56-4b59f55db432" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingIncomeExpenseNet_2fe5d35b-e8b0-4fc0-a13f-b7063fa14264" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherOperatingIncomeExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_4e1d8703-9df8-4e55-b1ce-aa5daacc2b06" xlink:to="loc_us-gaap_OtherOperatingIncomeExpenseNet_2fe5d35b-e8b0-4fc0-a13f-b7063fa14264" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_91d9f713-67f3-487e-951d-8d3867b3e809" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_4e1d8703-9df8-4e55-b1ce-aa5daacc2b06" xlink:to="loc_us-gaap_EquityMethodInvestments_91d9f713-67f3-487e-951d-8d3867b3e809" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/VariableInterestEntityDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#VariableInterestEntityDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/VariableInterestEntityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_cdd6de57-9bbe-4736-a67a-f84d4c281ad0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableInterestEntityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_11418b97-4379-4ce2-95d2-fa42c8ab17da" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_cdd6de57-9bbe-4736-a67a-f84d4c281ad0" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_11418b97-4379-4ce2-95d2-fa42c8ab17da" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_652db3ff-1e16-41a2-9b36-dcf9740848a0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_11418b97-4379-4ce2-95d2-fa42c8ab17da" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_652db3ff-1e16-41a2-9b36-dcf9740848a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_652db3ff-1e16-41a2-9b36-dcf9740848a0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_652db3ff-1e16-41a2-9b36-dcf9740848a0" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_652db3ff-1e16-41a2-9b36-dcf9740848a0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_91ed3354-a79b-43c6-965a-5d22ce2f50f3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_652db3ff-1e16-41a2-9b36-dcf9740848a0" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_91ed3354-a79b-43c6-965a-5d22ce2f50f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_WildHealthMember_952b4339-cd78-4b3b-a51a-7f7cea3cb91c" xlink:href="lpsn-20240630.xsd#lpsn_WildHealthMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_91ed3354-a79b-43c6-965a-5d22ce2f50f3" xlink:to="loc_lpsn_WildHealthMember_952b4339-cd78-4b3b-a51a-7f7cea3cb91c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_VariableInterestsNumberOfProfessionalCorporations_629697c2-743f-4dc2-9a39-7cd8fd344aa1" xlink:href="lpsn-20240630.xsd#lpsn_VariableInterestsNumberOfProfessionalCorporations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_cdd6de57-9bbe-4736-a67a-f84d4c281ad0" xlink:to="loc_lpsn_VariableInterestsNumberOfProfessionalCorporations_629697c2-743f-4dc2-9a39-7cd8fd344aa1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DisposalGroupIncludingDiscontinuedOperationOwnershipPercentageInDisposedAsset_67510029-d041-4310-8a7b-b6360b3c5a81" xlink:href="lpsn-20240630.xsd#lpsn_DisposalGroupIncludingDiscontinuedOperationOwnershipPercentageInDisposedAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_cdd6de57-9bbe-4736-a67a-f84d4c281ad0" xlink:to="loc_lpsn_DisposalGroupIncludingDiscontinuedOperationOwnershipPercentageInDisposedAsset_67510029-d041-4310-8a7b-b6360b3c5a81" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/RelatedPartiesDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#RelatedPartiesDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/RelatedPartiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_2970a11e-12ca-4a0b-9ef8-dd386dc51ee6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_66acfe3e-8586-4123-8090-7dbf40f4550c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_2970a11e-12ca-4a0b-9ef8-dd386dc51ee6" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_66acfe3e-8586-4123-8090-7dbf40f4550c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_10329c69-f7da-4a42-819a-735460826ea1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_66acfe3e-8586-4123-8090-7dbf40f4550c" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_10329c69-f7da-4a42-819a-735460826ea1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_10329c69-f7da-4a42-819a-735460826ea1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_10329c69-f7da-4a42-819a-735460826ea1" xlink:to="loc_us-gaap_RelatedPartyDomain_10329c69-f7da-4a42-819a-735460826ea1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_0798a466-4c5d-4cc5-b1b4-1e5ecdfb800a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_10329c69-f7da-4a42-819a-735460826ea1" xlink:to="loc_us-gaap_RelatedPartyDomain_0798a466-4c5d-4cc5-b1b4-1e5ecdfb800a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_f6667fa5-283e-4af8-a53f-0d0606e54a26" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_0798a466-4c5d-4cc5-b1b4-1e5ecdfb800a" xlink:to="loc_us-gaap_RelatedPartyMember_f6667fa5-283e-4af8-a53f-0d0606e54a26" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_370ee715-d623-45b4-842e-239d0dcbe835" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_2970a11e-12ca-4a0b-9ef8-dd386dc51ee6" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_370ee715-d623-45b4-842e-239d0dcbe835" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_19bcaa76-153e-4033-a5ac-0451c2db73e9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_2970a11e-12ca-4a0b-9ef8-dd386dc51ee6" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_19bcaa76-153e-4033-a5ac-0451c2db73e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_0754ce2a-8ce9-4369-a4ef-101ecbfeb932" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_2970a11e-12ca-4a0b-9ef8-dd386dc51ee6" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_0754ce2a-8ce9-4369-a4ef-101ecbfeb932" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/DivestitureNarrativeDetails" xlink:type="simple" xlink:href="lpsn-20240630.xsd#DivestitureNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/DivestitureNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_40913677-5f35-40f6-94d2-247aa8b7ad0d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_42473e73-a92f-4263-8f55-369057332ead" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_40913677-5f35-40f6-94d2-247aa8b7ad0d" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_42473e73-a92f-4263-8f55-369057332ead" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_e91cb864-8be2-434a-9b02-748cc17ba662" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_42473e73-a92f-4263-8f55-369057332ead" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_e91cb864-8be2-434a-9b02-748cc17ba662" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_e91cb864-8be2-434a-9b02-748cc17ba662_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_e91cb864-8be2-434a-9b02-748cc17ba662" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_e91cb864-8be2-434a-9b02-748cc17ba662_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_be17eca6-27fa-4146-8df3-bfeb904eee44" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_e91cb864-8be2-434a-9b02-748cc17ba662" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_be17eca6-27fa-4146-8df3-bfeb904eee44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_713f134a-2819-4d06-9c8e-e2296d0cea5e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_be17eca6-27fa-4146-8df3-bfeb904eee44" xlink:to="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_713f134a-2819-4d06-9c8e-e2296d0cea5e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_a7ef10ad-a622-42e6-8e4d-f8bb7b8893d2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_42473e73-a92f-4263-8f55-369057332ead" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_a7ef10ad-a622-42e6-8e4d-f8bb7b8893d2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_a7ef10ad-a622-42e6-8e4d-f8bb7b8893d2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_a7ef10ad-a622-42e6-8e4d-f8bb7b8893d2" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_a7ef10ad-a622-42e6-8e4d-f8bb7b8893d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_cefdd626-2b80-4137-bfaa-d0d4b109f6d3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_a7ef10ad-a622-42e6-8e4d-f8bb7b8893d2" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_cefdd626-2b80-4137-bfaa-d0d4b109f6d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_KasambaIncMember_deb1e029-03f7-4015-ba2f-752d6e62e0aa" xlink:href="lpsn-20240630.xsd#lpsn_KasambaIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_cefdd626-2b80-4137-bfaa-d0d4b109f6d3" xlink:to="loc_lpsn_KasambaIncMember_deb1e029-03f7-4015-ba2f-752d6e62e0aa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_WildHealthMember_7035ebe6-a41c-4892-b1a6-eb96fa8a8226" xlink:href="lpsn-20240630.xsd#lpsn_WildHealthMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_cefdd626-2b80-4137-bfaa-d0d4b109f6d3" xlink:to="loc_lpsn_WildHealthMember_7035ebe6-a41c-4892-b1a6-eb96fa8a8226" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DisposalGroupIncludingDiscontinuedOperationOwnershipPercentageInDisposedAsset_5fb95d31-f170-471f-b08c-6a54f86a704f" xlink:href="lpsn-20240630.xsd#lpsn_DisposalGroupIncludingDiscontinuedOperationOwnershipPercentageInDisposedAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_40913677-5f35-40f6-94d2-247aa8b7ad0d" xlink:to="loc_lpsn_DisposalGroupIncludingDiscontinuedOperationOwnershipPercentageInDisposedAsset_5fb95d31-f170-471f-b08c-6a54f86a704f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_f1c68f5a-0915-4668-90d5-848217da81d1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainLossOnSaleOfBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_40913677-5f35-40f6-94d2-247aa8b7ad0d" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_f1c68f5a-0915-4668-90d5-848217da81d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_98428001-d29b-4bff-ba84-ef353c00838b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_40913677-5f35-40f6-94d2-247aa8b7ad0d" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_98428001-d29b-4bff-ba84-ef353c00838b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DeferredProceedsFromDivestitureOfBusiness_48826ff9-32b4-4f10-ac44-9065dca35768" xlink:href="lpsn-20240630.xsd#lpsn_DeferredProceedsFromDivestitureOfBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_40913677-5f35-40f6-94d2-247aa8b7ad0d" xlink:to="loc_lpsn_DeferredProceedsFromDivestitureOfBusiness_48826ff9-32b4-4f10-ac44-9065dca35768" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCash_c08743e5-1200-44c3-9dcc-660ef9166a04" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_40913677-5f35-40f6-94d2-247aa8b7ad0d" xlink:to="loc_us-gaap_RestrictedCash_c08743e5-1200-44c3-9dcc-660ef9166a04" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_MaximumLengthOfTimeRestrictedCashHeldInEscrow_da815118-cc76-45dc-844f-b5783f861348" xlink:href="lpsn-20240630.xsd#lpsn_MaximumLengthOfTimeRestrictedCashHeldInEscrow"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_40913677-5f35-40f6-94d2-247aa8b7ad0d" xlink:to="loc_lpsn_MaximumLengthOfTimeRestrictedCashHeldInEscrow_da815118-cc76-45dc-844f-b5783f861348" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseOfRestrictedInvestments_cc012f15-e7ce-44a7-8590-301e6c39d495" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseOfRestrictedInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_40913677-5f35-40f6-94d2-247aa8b7ad0d" xlink:to="loc_us-gaap_IncreaseDecreaseOfRestrictedInvestments_cc012f15-e7ce-44a7-8590-301e6c39d495" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/AwardTypeOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#AwardTypeOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/AwardTypeOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WarrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_WarrantMember" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_EmployeeStockPurchasePlanMember_6db56f38-e853-4521-93fd-375f195a8d9f" xlink:href="lpsn-20240630.xsd#lpsn_EmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_lpsn_EmployeeStockPurchasePlanMember_6db56f38-e853-4521-93fd-375f195a8d9f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_IncentiveStockOptionMember_c263fa36-ae27-4e30-a9b7-c462d1a19ff7" xlink:href="lpsn-20240630.xsd#lpsn_IncentiveStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_lpsn_IncentiveStockOptionMember_c263fa36-ae27-4e30-a9b7-c462d1a19ff7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_CEOInducementAwardMember_e91f0e8c-8d33-4db1-8983-d8eb91846dd3" xlink:href="lpsn-20240630.xsd#lpsn_CEOInducementAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_lpsn_CEOInducementAwardMember_e91f0e8c-8d33-4db1-8983-d8eb91846dd3" xlink:type="arc" order="8"/>
  </link:definitionLink>
</link:linkbase>
