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

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2023 Workiva-->
<!--r:abd72629-003e-4e40-a080-0e4fce12a9fc,g:b968fd32-4c6e-4f5f-a6e3-2b9caffeb042-->
<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/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONSUnauditedParenthetical" xlink:type="simple" xlink:href="lpsn-20230331.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONSUnauditedParenthetical"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONSUnauditedParenthetical" xlink:type="extended" id="i1ceec097bc1745b789810c1c94e60340_CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONSUnauditedParenthetical">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_7b175ce3-7a24-4472-89fb-ac53a84fe76c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_af31a2b9-9ab5-4cbb-93c4-dc92f9da0cb3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7b175ce3-7a24-4472-89fb-ac53a84fe76c" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_af31a2b9-9ab5-4cbb-93c4-dc92f9da0cb3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationNonproduction_fb377ecb-755d-46c4-9f0b-82efaad448f7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DepreciationNonproduction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7b175ce3-7a24-4472-89fb-ac53a84fe76c" xlink:to="loc_us-gaap_DepreciationNonproduction_fb377ecb-755d-46c4-9f0b-82efaad448f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSoldAmortization_9a8f9f17-2688-4d0f-b73f-ffe8ffed2909" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostOfGoodsAndServicesSoldAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7b175ce3-7a24-4472-89fb-ac53a84fe76c" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSoldAmortization_9a8f9f17-2688-4d0f-b73f-ffe8ffed2909" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_46fb16bb-ad54-4111-a9d0-4bded497b2bd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_7b175ce3-7a24-4472-89fb-ac53a84fe76c" xlink:to="loc_us-gaap_StatementTable_46fb16bb-ad54-4111-a9d0-4bded497b2bd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_c49f92f5-9fc9-4635-945f-738eed9340af" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_46fb16bb-ad54-4111-a9d0-4bded497b2bd" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_c49f92f5-9fc9-4635-945f-738eed9340af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_c49f92f5-9fc9-4635-945f-738eed9340af_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_c49f92f5-9fc9-4635-945f-738eed9340af" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_c49f92f5-9fc9-4635-945f-738eed9340af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_19c7c359-d448-4330-9d70-9d2bdd469178" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_c49f92f5-9fc9-4635-945f-738eed9340af" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_19c7c359-d448-4330-9d70-9d2bdd469178" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_8620d3c8-2b11-4c9e-8431-f279faa67847" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_19c7c359-d448-4330-9d70-9d2bdd469178" xlink:to="loc_us-gaap_CostOfSalesMember_8620d3c8-2b11-4c9e-8431-f279faa67847" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_71d97d9f-5e45-40b4-95f6-2eb1f32d9fde" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SellingAndMarketingExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_19c7c359-d448-4330-9d70-9d2bdd469178" xlink:to="loc_us-gaap_SellingAndMarketingExpenseMember_71d97d9f-5e45-40b4-95f6-2eb1f32d9fde" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_13438f8c-1355-477a-a449-4b01e1553271" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GeneralAndAdministrativeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_19c7c359-d448-4330-9d70-9d2bdd469178" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_13438f8c-1355-477a-a449-4b01e1553271" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_8d39708a-a4cb-4e4a-8a20-060aa1a4672a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_19c7c359-d448-4330-9d70-9d2bdd469178" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_8d39708a-a4cb-4e4a-8a20-060aa1a4672a" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYunaudited" xlink:type="simple" xlink:href="lpsn-20230331.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYunaudited"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYunaudited" xlink:type="extended" id="i0c9472476f3a4440bf6543f9f2d15491_CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYunaudited">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_07a24a6a-ef94-4c95-bd66-9d7d45575bd0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_17bf53a5-9a40-461f-a82a-90dc5a5ed6e7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_07a24a6a-ef94-4c95-bd66-9d7d45575bd0" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_17bf53a5-9a40-461f-a82a-90dc5a5ed6e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_e8a312bb-a5c1-4982-9ab6-be17b3bf839c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_17bf53a5-9a40-461f-a82a-90dc5a5ed6e7" xlink:to="loc_us-gaap_StockholdersEquity_e8a312bb-a5c1-4982-9ab6-be17b3bf839c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_db0a9f0e-df3c-47a5-82a5-cdd3bf7cffbb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_17bf53a5-9a40-461f-a82a-90dc5a5ed6e7" xlink:to="loc_us-gaap_SharesOutstanding_db0a9f0e-df3c-47a5-82a5-cdd3bf7cffbb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_dcfba297-92d5-48b0-9df6-76a9b970f9fa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_17bf53a5-9a40-461f-a82a-90dc5a5ed6e7" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_dcfba297-92d5-48b0-9df6-76a9b970f9fa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_0103f307-41db-4e93-83f8-9d96fe8454ac" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_17bf53a5-9a40-461f-a82a-90dc5a5ed6e7" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_0103f307-41db-4e93-83f8-9d96fe8454ac" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_4c30ab40-7e44-4b7b-9b85-a5ff8e79764c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_17bf53a5-9a40-461f-a82a-90dc5a5ed6e7" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_4c30ab40-7e44-4b7b-9b85-a5ff8e79764c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_da70d117-dd2a-4477-af53-d8284696d683" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_17bf53a5-9a40-461f-a82a-90dc5a5ed6e7" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_da70d117-dd2a-4477-af53-d8284696d683" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_e144dda6-3f03-4377-bfc7-78b9ffa176da" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_17bf53a5-9a40-461f-a82a-90dc5a5ed6e7" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_e144dda6-3f03-4377-bfc7-78b9ffa176da" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_StockIssuedDuringPeriodValueBonusPaymentSettledInShares_0e55a18d-0846-4a2c-ba2b-6f7b69254894" xlink:href="lpsn-20230331.xsd#lpsn_StockIssuedDuringPeriodValueBonusPaymentSettledInShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_17bf53a5-9a40-461f-a82a-90dc5a5ed6e7" xlink:to="loc_lpsn_StockIssuedDuringPeriodValueBonusPaymentSettledInShares_0e55a18d-0846-4a2c-ba2b-6f7b69254894" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_StockIssuedDuringPeriodSharesBonusPaymentSettledInShares_4757392f-7aae-4e61-acc4-5c2ed9ea663f" xlink:href="lpsn-20230331.xsd#lpsn_StockIssuedDuringPeriodSharesBonusPaymentSettledInShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_17bf53a5-9a40-461f-a82a-90dc5a5ed6e7" xlink:to="loc_lpsn_StockIssuedDuringPeriodSharesBonusPaymentSettledInShares_4757392f-7aae-4e61-acc4-5c2ed9ea663f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_530a895a-392f-4484-8470-005db97daf75" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_17bf53a5-9a40-461f-a82a-90dc5a5ed6e7" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_530a895a-392f-4484-8470-005db97daf75" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_68ab5b1e-a78f-496f-a70a-b53923922dfc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_17bf53a5-9a40-461f-a82a-90dc5a5ed6e7" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_68ab5b1e-a78f-496f-a70a-b53923922dfc" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_e14d91ed-1d83-43d9-8a52-7b215aae47ae" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_17bf53a5-9a40-461f-a82a-90dc5a5ed6e7" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_e14d91ed-1d83-43d9-8a52-7b215aae47ae" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_70567544-6531-4583-b611-fe8bb51638b5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_17bf53a5-9a40-461f-a82a-90dc5a5ed6e7" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_70567544-6531-4583-b611-fe8bb51638b5" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_AdjustmentsToAdditionalPaidInCapitalDivestiture_17bdcbba-f708-44aa-8464-6d552b8fcc0c" xlink:href="lpsn-20230331.xsd#lpsn_AdjustmentsToAdditionalPaidInCapitalDivestiture"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_17bf53a5-9a40-461f-a82a-90dc5a5ed6e7" xlink:to="loc_lpsn_AdjustmentsToAdditionalPaidInCapitalDivestiture_17bdcbba-f708-44aa-8464-6d552b8fcc0c" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_f8fc6473-e409-4f8b-9998-3bc8cb05fdd1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_17bf53a5-9a40-461f-a82a-90dc5a5ed6e7" xlink:to="loc_us-gaap_NetIncomeLoss_f8fc6473-e409-4f8b-9998-3bc8cb05fdd1" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_8ae1a16b-9b01-462b-a187-5af23987f014" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_17bf53a5-9a40-461f-a82a-90dc5a5ed6e7" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_8ae1a16b-9b01-462b-a187-5af23987f014" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_394c1ae1-f9d6-4e00-8ad7-8f885d8ab8d9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_c5c9b0b9-3938-4594-8e9c-d5322be6448b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_71787b5b-1d17-4126-9dd0-c8a1c7eeb376" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_07a24a6a-ef94-4c95-bd66-9d7d45575bd0" xlink:to="loc_us-gaap_StatementTable_71787b5b-1d17-4126-9dd0-c8a1c7eeb376" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_773a69a3-5b38-4539-9458-a918bc574ba6" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_71787b5b-1d17-4126-9dd0-c8a1c7eeb376" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_773a69a3-5b38-4539-9458-a918bc574ba6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_773a69a3-5b38-4539-9458-a918bc574ba6_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_773a69a3-5b38-4539-9458-a918bc574ba6" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_773a69a3-5b38-4539-9458-a918bc574ba6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_0370e43f-78e3-4072-9748-2a5bc90c00a8" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_773a69a3-5b38-4539-9458-a918bc574ba6" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_0370e43f-78e3-4072-9748-2a5bc90c00a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_00fe3f87-a414-4136-b746-2f91be6e31c5" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_0370e43f-78e3-4072-9748-2a5bc90c00a8" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_00fe3f87-a414-4136-b746-2f91be6e31c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_f7d57f33-d5d7-4e32-ab83-352838877742" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_71787b5b-1d17-4126-9dd0-c8a1c7eeb376" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_f7d57f33-d5d7-4e32-ab83-352838877742" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_f7d57f33-d5d7-4e32-ab83-352838877742_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_f7d57f33-d5d7-4e32-ab83-352838877742" xlink:to="loc_us-gaap_EquityComponentDomain_f7d57f33-d5d7-4e32-ab83-352838877742_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_abca7c3a-81eb-4bc5-b068-d9bc288c354a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_f7d57f33-d5d7-4e32-ab83-352838877742" xlink:to="loc_us-gaap_EquityComponentDomain_abca7c3a-81eb-4bc5-b068-d9bc288c354a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_a51e1028-f505-45de-964d-b2a4faca4dd7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_abca7c3a-81eb-4bc5-b068-d9bc288c354a" xlink:to="loc_us-gaap_CommonStockMember_a51e1028-f505-45de-964d-b2a4faca4dd7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockMember_7a6e8b91-ee2c-4540-b75f-8b8848230bd3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_abca7c3a-81eb-4bc5-b068-d9bc288c354a" xlink:to="loc_us-gaap_TreasuryStockMember_7a6e8b91-ee2c-4540-b75f-8b8848230bd3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_31db35b1-5c3d-4e73-87c4-fcc55a2707b6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_abca7c3a-81eb-4bc5-b068-d9bc288c354a" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_31db35b1-5c3d-4e73-87c4-fcc55a2707b6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_6c8b1698-187b-4846-a75f-bab67719e294" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_abca7c3a-81eb-4bc5-b068-d9bc288c354a" xlink:to="loc_us-gaap_RetainedEarningsMember_6c8b1698-187b-4846-a75f-bab67719e294" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_ad65108f-c6af-424f-bf3e-961bda896aab" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_abca7c3a-81eb-4bc5-b068-d9bc288c354a" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_ad65108f-c6af-424f-bf3e-961bda896aab" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_f9f58b3c-ad8f-4e30-99f1-1c0a01fbe6ea" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_71787b5b-1d17-4126-9dd0-c8a1c7eeb376" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_f9f58b3c-ad8f-4e30-99f1-1c0a01fbe6ea" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_f9f58b3c-ad8f-4e30-99f1-1c0a01fbe6ea_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfAdoptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_f9f58b3c-ad8f-4e30-99f1-1c0a01fbe6ea" xlink:to="loc_us-gaap_TypeOfAdoptionMember_f9f58b3c-ad8f-4e30-99f1-1c0a01fbe6ea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_bb8fb6f5-74bb-4130-9c23-5e0575a4aaf4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfAdoptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_f9f58b3c-ad8f-4e30-99f1-1c0a01fbe6ea" xlink:to="loc_us-gaap_TypeOfAdoptionMember_bb8fb6f5-74bb-4130-9c23-5e0575a4aaf4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingStandardsUpdate202006Member_d830fc33-f5bb-4bd4-a24f-152aa94d8494" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountingStandardsUpdate202006Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_bb8fb6f5-74bb-4130-9c23-5e0575a4aaf4" xlink:to="loc_us-gaap_AccountingStandardsUpdate202006Member_d830fc33-f5bb-4bd4-a24f-152aa94d8494" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUnaudited" xlink:type="simple" xlink:href="lpsn-20230331.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUnaudited"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUnaudited" xlink:type="extended" id="iaeee408179794b349e8075cfcc5c62bf_CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUnaudited">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_4246fec1-9c0a-4639-a4c4-3df40396605e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_1002ebc6-6d57-453e-a81a-1e19151d37e8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4246fec1-9c0a-4639-a4c4-3df40396605e" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_1002ebc6-6d57-453e-a81a-1e19151d37e8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_5d4919df-6de9-4685-9aeb-cf1609a20924" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_1002ebc6-6d57-453e-a81a-1e19151d37e8" xlink:to="loc_us-gaap_NetIncomeLoss_5d4919df-6de9-4685-9aeb-cf1609a20924" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_117a35b6-29f5-4cb6-9bdb-317ebed9e1a7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_1002ebc6-6d57-453e-a81a-1e19151d37e8" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_117a35b6-29f5-4cb6-9bdb-317ebed9e1a7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_b15752fe-4dcd-48c0-8499-7c30ed3bc1b1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_117a35b6-29f5-4cb6-9bdb-317ebed9e1a7" xlink:to="loc_us-gaap_ShareBasedCompensation_b15752fe-4dcd-48c0-8499-7c30ed3bc1b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_b9b86cfc-024a-4f68-b4a3-c3b863224a63" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_117a35b6-29f5-4cb6-9bdb-317ebed9e1a7" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_b9b86cfc-024a-4f68-b4a3-c3b863224a63" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_AmortizationOfIntangibleAssetsAndFinanceLeases_f29f7460-6e3e-4181-970b-400c79a5a5e1" xlink:href="lpsn-20230331.xsd#lpsn_AmortizationOfIntangibleAssetsAndFinanceLeases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_117a35b6-29f5-4cb6-9bdb-317ebed9e1a7" xlink:to="loc_lpsn_AmortizationOfIntangibleAssetsAndFinanceLeases_f29f7460-6e3e-4181-970b-400c79a5a5e1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_1b15ed54-f642-43ef-9c88-0a8684aad0b0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AmortizationOfFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_117a35b6-29f5-4cb6-9bdb-317ebed9e1a7" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_1b15ed54-f642-43ef-9c88-0a8684aad0b0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_a9120fcb-af71-49ad-a2b2-29a37c9414ff" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_117a35b6-29f5-4cb6-9bdb-317ebed9e1a7" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_a9120fcb-af71-49ad-a2b2-29a37c9414ff" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_GainLossOnRepurchaseOfConvertibleNotes_e503a991-608c-4ec1-af3b-d29bb864e630" xlink:href="lpsn-20230331.xsd#lpsn_GainLossOnRepurchaseOfConvertibleNotes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_117a35b6-29f5-4cb6-9bdb-317ebed9e1a7" xlink:to="loc_lpsn_GainLossOnRepurchaseOfConvertibleNotes_e503a991-608c-4ec1-af3b-d29bb864e630" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_d5a35f25-6a70-4f42-bde8-d60d35ae7f64" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_117a35b6-29f5-4cb6-9bdb-317ebed9e1a7" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_d5a35f25-6a70-4f42-bde8-d60d35ae7f64" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_GainLossOnDivestiture_be5e2227-746c-481f-b4d9-15097199a240" xlink:href="lpsn-20230331.xsd#lpsn_GainLossOnDivestiture"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_117a35b6-29f5-4cb6-9bdb-317ebed9e1a7" xlink:to="loc_lpsn_GainLossOnDivestiture_be5e2227-746c-481f-b4d9-15097199a240" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_3922cf0f-9e4b-490e-9d59-15bfee28d35a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_117a35b6-29f5-4cb6-9bdb-317ebed9e1a7" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_3922cf0f-9e4b-490e-9d59-15bfee28d35a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_EquityGainLossInJointVenture_eb195fd9-48b8-4555-9855-9b89b71bf744" xlink:href="lpsn-20230331.xsd#lpsn_EquityGainLossInJointVenture"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_117a35b6-29f5-4cb6-9bdb-317ebed9e1a7" xlink:to="loc_lpsn_EquityGainLossInJointVenture_eb195fd9-48b8-4555-9855-9b89b71bf744" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_3a72b503-713d-4c3e-9b91-ffc87e91ddfa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_1002ebc6-6d57-453e-a81a-1e19151d37e8" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_3a72b503-713d-4c3e-9b91-ffc87e91ddfa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_421430b3-a924-4298-83da-bc91530b1644" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_3a72b503-713d-4c3e-9b91-ffc87e91ddfa" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_421430b3-a924-4298-83da-bc91530b1644" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_IncreaseDecreaseInPrepaidExpenseAndOtherCurrentAssets_bf7025e7-e63e-4a9c-8891-972b08a6add8" xlink:href="lpsn-20230331.xsd#lpsn_IncreaseDecreaseInPrepaidExpenseAndOtherCurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_3a72b503-713d-4c3e-9b91-ffc87e91ddfa" xlink:to="loc_lpsn_IncreaseDecreaseInPrepaidExpenseAndOtherCurrentAssets_bf7025e7-e63e-4a9c-8891-972b08a6add8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_IncreaseDecreaseInCapitalizedContractCost_55c67603-835b-4491-84f6-ee850fa0238c" xlink:href="lpsn-20230331.xsd#lpsn_IncreaseDecreaseInCapitalizedContractCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_3a72b503-713d-4c3e-9b91-ffc87e91ddfa" xlink:to="loc_lpsn_IncreaseDecreaseInCapitalizedContractCost_55c67603-835b-4491-84f6-ee850fa0238c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_16738475-db91-4753-8218-d8887826fe39" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_3a72b503-713d-4c3e-9b91-ffc87e91ddfa" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_16738475-db91-4753-8218-d8887826fe39" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_65e5bae6-52a2-4b45-a9d4-903d0f45386b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_3a72b503-713d-4c3e-9b91-ffc87e91ddfa" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_65e5bae6-52a2-4b45-a9d4-903d0f45386b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_35cbea42-1e5f-4c27-af18-eb718b954545" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_3a72b503-713d-4c3e-9b91-ffc87e91ddfa" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_35cbea42-1e5f-4c27-af18-eb718b954545" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_407f0a45-5750-406d-80fb-5d646647019f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_3a72b503-713d-4c3e-9b91-ffc87e91ddfa" xlink:to="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_407f0a45-5750-406d-80fb-5d646647019f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingLeaseLiability_2ead1737-72d1-4c0c-bb28-a5771f3f4989" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_3a72b503-713d-4c3e-9b91-ffc87e91ddfa" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingLeaseLiability_2ead1737-72d1-4c0c-bb28-a5771f3f4989" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_5120de23-e364-437e-8c10-9b358ae75737" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_3a72b503-713d-4c3e-9b91-ffc87e91ddfa" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_5120de23-e364-437e-8c10-9b358ae75737" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d178c14f-d254-4d35-a677-84e389f6ecf6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_1002ebc6-6d57-453e-a81a-1e19151d37e8" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d178c14f-d254-4d35-a677-84e389f6ecf6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4d76b014-e65b-418e-bb08-5418ac8785a4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4246fec1-9c0a-4639-a4c4-3df40396605e" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4d76b014-e65b-418e-bb08-5418ac8785a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_b96b703b-5a8d-4781-bb95-d463a21a7ab6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4d76b014-e65b-418e-bb08-5418ac8785a4" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_b96b703b-5a8d-4781-bb95-d463a21a7ab6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_333c7c24-fbfb-41b7-b484-46cb6a0b362e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4d76b014-e65b-418e-bb08-5418ac8785a4" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_333c7c24-fbfb-41b7-b484-46cb6a0b362e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireIntangibleAssets_5a97097d-1a61-4557-ad22-8af7f9fb4dc6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquireIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4d76b014-e65b-418e-bb08-5418ac8785a4" xlink:to="loc_us-gaap_PaymentsToAcquireIntangibleAssets_5a97097d-1a61-4557-ad22-8af7f9fb4dc6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_e3d2562c-6904-4188-a8c1-f41bdaed57b4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4d76b014-e65b-418e-bb08-5418ac8785a4" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_e3d2562c-6904-4188-a8c1-f41bdaed57b4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireInterestInJointVenture_6b89dd36-ea60-47bb-9e95-5abbed377dfa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquireInterestInJointVenture"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4d76b014-e65b-418e-bb08-5418ac8785a4" xlink:to="loc_us-gaap_PaymentsToAcquireInterestInJointVenture_6b89dd36-ea60-47bb-9e95-5abbed377dfa" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_f497fdb4-e3dd-44f1-8e96-9d615256a28b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4d76b014-e65b-418e-bb08-5418ac8785a4" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_f497fdb4-e3dd-44f1-8e96-9d615256a28b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_2514ebbd-5f66-4eea-a750-9c235ad615a6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4246fec1-9c0a-4639-a4c4-3df40396605e" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_2514ebbd-5f66-4eea-a750-9c235ad615a6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeasePrincipalPayments_2f6e2e66-90f6-423b-80de-972bc2f07de7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeasePrincipalPayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_2514ebbd-5f66-4eea-a750-9c235ad615a6" xlink:to="loc_us-gaap_FinanceLeasePrincipalPayments_2f6e2e66-90f6-423b-80de-972bc2f07de7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_f89b81c6-a565-4189-b4dc-b43f86f284e6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_2514ebbd-5f66-4eea-a750-9c235ad615a6" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_f89b81c6-a565-4189-b4dc-b43f86f284e6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfConvertiblePreferredStock_c3441b7f-4197-44fb-b898-ec9d025a20a1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsForRepurchaseOfConvertiblePreferredStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_2514ebbd-5f66-4eea-a750-9c235ad615a6" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfConvertiblePreferredStock_c3441b7f-4197-44fb-b898-ec9d025a20a1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_f6149009-5f90-4f63-aab6-b916b0f29457" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_2514ebbd-5f66-4eea-a750-9c235ad615a6" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_f6149009-5f90-4f63-aab6-b916b0f29457" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_c986c506-a4fe-46f7-9f50-3d30d49b7292" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4246fec1-9c0a-4639-a4c4-3df40396605e" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_c986c506-a4fe-46f7-9f50-3d30d49b7292" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_c51f6f3b-ddca-4e71-8e57-d4f1a1c05a74" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4246fec1-9c0a-4639-a4c4-3df40396605e" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_c51f6f3b-ddca-4e71-8e57-d4f1a1c05a74" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_4dfcc8b0-ed09-477c-8605-b3ac66ced654" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4246fec1-9c0a-4639-a4c4-3df40396605e" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_4dfcc8b0-ed09-477c-8605-b3ac66ced654" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_f3bf6777-2f15-4e12-893d-8023a6ccaf6c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_AssetsHeldForSaleCashCurrent_4ce82d35-3ee5-4dfc-905c-b95545583e35" xlink:href="lpsn-20230331.xsd#lpsn_AssetsHeldForSaleCashCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4246fec1-9c0a-4639-a4c4-3df40396605e" xlink:to="loc_lpsn_AssetsHeldForSaleCashCurrent_4ce82d35-3ee5-4dfc-905c-b95545583e35" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_278ce8e3-c9de-4681-8fd0-91f6e0b6b364" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4246fec1-9c0a-4639-a4c4-3df40396605e" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_278ce8e3-c9de-4681-8fd0-91f6e0b6b364" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_6b1ee00e-1f06-4ee3-abb7-1a372749f745" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_278ce8e3-c9de-4681-8fd0-91f6e0b6b364" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_6b1ee00e-1f06-4ee3-abb7-1a372749f745" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCash_55ac1d9f-e0b6-4392-957e-85238c8df492" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_278ce8e3-c9de-4681-8fd0-91f6e0b6b364" xlink:to="loc_us-gaap_RestrictedCash_55ac1d9f-e0b6-4392-957e-85238c8df492" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_aba47efc-f985-4788-bd29-5a52dbd00c07" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_7c762fbe-7b26-4948-aafd-b64aa659c684" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4246fec1-9c0a-4639-a4c4-3df40396605e" xlink:to="loc_us-gaap_SupplementalCashFlowInformationAbstract_7c762fbe-7b26-4948-aafd-b64aa659c684" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_f97e3a2a-8b21-46a9-9819-34ac8f2172e9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxesPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_7c762fbe-7b26-4948-aafd-b64aa659c684" xlink:to="loc_us-gaap_IncomeTaxesPaidNet_f97e3a2a-8b21-46a9-9819-34ac8f2172e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidNet_23f7733a-0dd5-46c7-8430-dc7bc125dc22" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_7c762fbe-7b26-4948-aafd-b64aa659c684" xlink:to="loc_us-gaap_InterestPaidNet_23f7733a-0dd5-46c7-8430-dc7bc125dc22" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_90df6926-6119-4fda-86f5-6427b13cb3f5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4246fec1-9c0a-4639-a4c4-3df40396605e" xlink:to="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_90df6926-6119-4fda-86f5-6427b13cb3f5" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_9660ba69-7294-4ae7-adb8-7e3fd9ba795e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalExpendituresIncurredButNotYetPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_90df6926-6119-4fda-86f5-6427b13cb3f5" xlink:to="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_9660ba69-7294-4ae7-adb8-7e3fd9ba795e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_OperatingLeaseRightOfUseAssetSupplementalCashFlow_8c41edfc-6486-4461-8a88-6db9b385ff27" xlink:href="lpsn-20230331.xsd#lpsn_OperatingLeaseRightOfUseAssetSupplementalCashFlow"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_90df6926-6119-4fda-86f5-6427b13cb3f5" xlink:to="loc_lpsn_OperatingLeaseRightOfUseAssetSupplementalCashFlow_8c41edfc-6486-4461-8a88-6db9b385ff27" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssued1_0ce21294-838d-4b24-b47a-51261853f1c7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssued1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_90df6926-6119-4fda-86f5-6427b13cb3f5" xlink:to="loc_us-gaap_StockIssued1_0ce21294-838d-4b24-b47a-51261853f1c7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_NoncashOrPartNoncashAcquisitionContingentLiability_009ce697-cabf-43ec-93e1-ba741fd769a9" xlink:href="lpsn-20230331.xsd#lpsn_NoncashOrPartNoncashAcquisitionContingentLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_90df6926-6119-4fda-86f5-6427b13cb3f5" xlink:to="loc_lpsn_NoncashOrPartNoncashAcquisitionContingentLiability_009ce697-cabf-43ec-93e1-ba741fd769a9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_4178d358-62e3-4f51-b82d-fcfb1cbc9e84" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_4246fec1-9c0a-4639-a4c4-3df40396605e" xlink:to="loc_us-gaap_StatementTable_4178d358-62e3-4f51-b82d-fcfb1cbc9e84" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis_dfe03588-8215-4802-a866-6bf6cb6da476" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_4178d358-62e3-4f51-b82d-fcfb1cbc9e84" xlink:to="loc_us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis_dfe03588-8215-4802-a866-6bf6cb6da476" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncashOrPartNoncashAcquisitionNameDomain_dfe03588-8215-4802-a866-6bf6cb6da476_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NoncashOrPartNoncashAcquisitionNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis_dfe03588-8215-4802-a866-6bf6cb6da476" xlink:to="loc_us-gaap_NoncashOrPartNoncashAcquisitionNameDomain_dfe03588-8215-4802-a866-6bf6cb6da476_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncashOrPartNoncashAcquisitionNameDomain_17f59cca-e4b4-4751-99dd-afb216bb63e8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NoncashOrPartNoncashAcquisitionNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis_dfe03588-8215-4802-a866-6bf6cb6da476" xlink:to="loc_us-gaap_NoncashOrPartNoncashAcquisitionNameDomain_17f59cca-e4b4-4751-99dd-afb216bb63e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_WildHealthMember_1aa01a11-e083-49a3-a81d-89daec1e1eb7" xlink:href="lpsn-20230331.xsd#lpsn_WildHealthMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionNameDomain_17f59cca-e4b4-4751-99dd-afb216bb63e8" xlink:to="loc_lpsn_WildHealthMember_1aa01a11-e083-49a3-a81d-89daec1e1eb7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/DescriptionofBusinessandBasisofPresentationDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#DescriptionofBusinessandBasisofPresentationDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/DescriptionofBusinessandBasisofPresentationDetails" xlink:type="extended" id="i5479475dc4ab4255bea1d7ac944c072a_DescriptionofBusinessandBasisofPresentationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_d6b8a38b-df74-4fc2-8373-dffbc69ccc2e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_NumberOfApplicationProgrammingInterfacesAndSoftwareDevelopmentKits_564bfeae-c276-4800-8aef-21d2182b1577" xlink:href="lpsn-20230331.xsd#lpsn_NumberOfApplicationProgrammingInterfacesAndSoftwareDevelopmentKits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_d6b8a38b-df74-4fc2-8373-dffbc69ccc2e" xlink:to="loc_lpsn_NumberOfApplicationProgrammingInterfacesAndSoftwareDevelopmentKits_564bfeae-c276-4800-8aef-21d2182b1577" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_3d5d2e4a-bb89-4166-8138-3c94a7a3dca9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_d6b8a38b-df74-4fc2-8373-dffbc69ccc2e" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_3d5d2e4a-bb89-4166-8138-3c94a7a3dca9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_b75ee05d-c31a-48b8-a0fa-14fe4d5dad2d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_d6b8a38b-df74-4fc2-8373-dffbc69ccc2e" xlink:to="loc_us-gaap_StockholdersEquity_b75ee05d-c31a-48b8-a0fa-14fe4d5dad2d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentIncreaseDecreaseForPeriodNet_6729a417-df8a-4f5e-80f7-c045a7124800" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentIncreaseDecreaseForPeriodNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_d6b8a38b-df74-4fc2-8373-dffbc69ccc2e" xlink:to="loc_us-gaap_DebtInstrumentIncreaseDecreaseForPeriodNet_6729a417-df8a-4f5e-80f7-c045a7124800" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_35b587a6-1d2f-4e4e-94f2-c0b2b75cc727" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_d6b8a38b-df74-4fc2-8373-dffbc69ccc2e" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_35b587a6-1d2f-4e4e-94f2-c0b2b75cc727" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_bd1766b0-d348-460c-9150-0acb9ef33d8c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_d6b8a38b-df74-4fc2-8373-dffbc69ccc2e" xlink:to="loc_us-gaap_StatementTable_bd1766b0-d348-460c-9150-0acb9ef33d8c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_2f92f9d3-03a5-4a90-b571-83a6cbbda17d" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_bd1766b0-d348-460c-9150-0acb9ef33d8c" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_2f92f9d3-03a5-4a90-b571-83a6cbbda17d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_2f92f9d3-03a5-4a90-b571-83a6cbbda17d_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_2f92f9d3-03a5-4a90-b571-83a6cbbda17d" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_2f92f9d3-03a5-4a90-b571-83a6cbbda17d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_a98e1f57-355a-4e3c-8a54-9463e9827eb3" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_2f92f9d3-03a5-4a90-b571-83a6cbbda17d" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_a98e1f57-355a-4e3c-8a54-9463e9827eb3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_f9b05248-14cf-4b9f-bd45-83365bae5a85" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_a98e1f57-355a-4e3c-8a54-9463e9827eb3" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_f9b05248-14cf-4b9f-bd45-83365bae5a85" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_85b0e042-5510-4d75-beca-f863b012ecb7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_bd1766b0-d348-460c-9150-0acb9ef33d8c" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_85b0e042-5510-4d75-beca-f863b012ecb7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_85b0e042-5510-4d75-beca-f863b012ecb7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfAdoptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_85b0e042-5510-4d75-beca-f863b012ecb7" xlink:to="loc_us-gaap_TypeOfAdoptionMember_85b0e042-5510-4d75-beca-f863b012ecb7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_36318904-6cf8-4035-a312-a6d59877579a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfAdoptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_85b0e042-5510-4d75-beca-f863b012ecb7" xlink:to="loc_us-gaap_TypeOfAdoptionMember_36318904-6cf8-4035-a312-a6d59877579a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingStandardsUpdate202006Member_3fb340c2-b0d9-4f53-bc28-fab9e6ff9597" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountingStandardsUpdate202006Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_36318904-6cf8-4035-a312-a6d59877579a" xlink:to="loc_us-gaap_AccountingStandardsUpdate202006Member_3fb340c2-b0d9-4f53-bc28-fab9e6ff9597" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_76b77843-ec74-433b-8dc5-cc8011a4ede2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_bd1766b0-d348-460c-9150-0acb9ef33d8c" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_76b77843-ec74-433b-8dc5-cc8011a4ede2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_76b77843-ec74-433b-8dc5-cc8011a4ede2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_76b77843-ec74-433b-8dc5-cc8011a4ede2" xlink:to="loc_us-gaap_EquityComponentDomain_76b77843-ec74-433b-8dc5-cc8011a4ede2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_255da5aa-8ced-4d7d-ad36-12b8beb18d8a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_76b77843-ec74-433b-8dc5-cc8011a4ede2" xlink:to="loc_us-gaap_EquityComponentDomain_255da5aa-8ced-4d7d-ad36-12b8beb18d8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_0d4bd401-a03b-4416-b3cf-958b21e4a462" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_255da5aa-8ced-4d7d-ad36-12b8beb18d8a" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_0d4bd401-a03b-4416-b3cf-958b21e4a462" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_60070355-af9a-4be5-a490-cdf2c7ea50b6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_255da5aa-8ced-4d7d-ad36-12b8beb18d8a" xlink:to="loc_us-gaap_RetainedEarningsMember_60070355-af9a-4be5-a490-cdf2c7ea50b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_7eefe33f-16f4-4011-b295-82f20baba101" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_bd1766b0-d348-460c-9150-0acb9ef33d8c" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_7eefe33f-16f4-4011-b295-82f20baba101" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_7eefe33f-16f4-4011-b295-82f20baba101_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_7eefe33f-16f4-4011-b295-82f20baba101" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_7eefe33f-16f4-4011-b295-82f20baba101_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_a6a3cc89-af9c-4fd1-a5f7-468e94960103" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_7eefe33f-16f4-4011-b295-82f20baba101" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_a6a3cc89-af9c-4fd1-a5f7-468e94960103" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_KasambaIncMember_eff0a447-6c5d-4428-a90b-0e2769ac63cb" xlink:href="lpsn-20230331.xsd#lpsn_KasambaIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_a6a3cc89-af9c-4fd1-a5f7-468e94960103" xlink:to="loc_lpsn_KasambaIncMember_eff0a447-6c5d-4428-a90b-0e2769ac63cb" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/RevenueRecognitionDeferredRevenueDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#RevenueRecognitionDeferredRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/RevenueRecognitionDeferredRevenueDetails" xlink:type="extended" id="i93c849dc40d949649f332272814a3bf4_RevenueRecognitionDeferredRevenueDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_f12b2e20-126e-4b0b-998c-48c16987f9f7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_089dfead-de58-42a9-94e3-b25da104b3eb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_f12b2e20-126e-4b0b-998c-48c16987f9f7" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_089dfead-de58-42a9-94e3-b25da104b3eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_161fd5a3-1c55-4933-9988-2728ad681476" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_f12b2e20-126e-4b0b-998c-48c16987f9f7" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_161fd5a3-1c55-4933-9988-2728ad681476" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_46923a52-1586-46ea-85f1-c603ecd5dc08" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_f12b2e20-126e-4b0b-998c-48c16987f9f7" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_46923a52-1586-46ea-85f1-c603ecd5dc08" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_80876c4f-5ffa-4ea0-a4d7-7477a051958a" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_46923a52-1586-46ea-85f1-c603ecd5dc08" xlink:to="loc_srt_ProductOrServiceAxis_80876c4f-5ffa-4ea0-a4d7-7477a051958a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_80876c4f-5ffa-4ea0-a4d7-7477a051958a_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_80876c4f-5ffa-4ea0-a4d7-7477a051958a" xlink:to="loc_srt_ProductsAndServicesDomain_80876c4f-5ffa-4ea0-a4d7-7477a051958a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_94fd52b0-643b-4dfb-ad79-417c01129616" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_80876c4f-5ffa-4ea0-a4d7-7477a051958a" xlink:to="loc_srt_ProductsAndServicesDomain_94fd52b0-643b-4dfb-ad79-417c01129616" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_HostedServicesBusinessMember_7d249ef5-8e76-4ef7-b978-643f0c0a628e" xlink:href="lpsn-20230331.xsd#lpsn_HostedServicesBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_94fd52b0-643b-4dfb-ad79-417c01129616" xlink:to="loc_lpsn_HostedServicesBusinessMember_7d249ef5-8e76-4ef7-b978-643f0c0a628e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ProfessionalServicesMember_55ee5493-907c-44c0-a845-cd837706b27c" xlink:href="lpsn-20230331.xsd#lpsn_ProfessionalServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_94fd52b0-643b-4dfb-ad79-417c01129616" xlink:to="loc_lpsn_ProfessionalServicesMember_55ee5493-907c-44c0-a845-cd837706b27c" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/RevenueRecognitionDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#RevenueRecognitionDisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/RevenueRecognitionDisaggregationofRevenueDetails" xlink:type="extended" id="ib2c185e5f65c46b7afc0ea2223262cd5_RevenueRecognitionDisaggregationofRevenueDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_40204419-7ba5-432c-9ddd-e52fbbce7ad5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_e4de9842-5b72-4467-b613-81c39aaa603a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_40204419-7ba5-432c-9ddd-e52fbbce7ad5" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_e4de9842-5b72-4467-b613-81c39aaa603a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_b1b69a2b-e08c-4626-809a-27e3ce5da6ff" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_40204419-7ba5-432c-9ddd-e52fbbce7ad5" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_b1b69a2b-e08c-4626-809a-27e3ce5da6ff" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_41653eee-f31b-4b0c-92d5-fe7aeb20f61e" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_b1b69a2b-e08c-4626-809a-27e3ce5da6ff" xlink:to="loc_srt_ProductOrServiceAxis_41653eee-f31b-4b0c-92d5-fe7aeb20f61e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_41653eee-f31b-4b0c-92d5-fe7aeb20f61e_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_41653eee-f31b-4b0c-92d5-fe7aeb20f61e" xlink:to="loc_srt_ProductsAndServicesDomain_41653eee-f31b-4b0c-92d5-fe7aeb20f61e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_9dc00109-49ed-4d0e-addd-fb6e0d1e8df7" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_41653eee-f31b-4b0c-92d5-fe7aeb20f61e" xlink:to="loc_srt_ProductsAndServicesDomain_9dc00109-49ed-4d0e-addd-fb6e0d1e8df7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_HostedServicesBusinessMember_3e331688-4a2b-46f2-88c1-d89446d226bc" xlink:href="lpsn-20230331.xsd#lpsn_HostedServicesBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_9dc00109-49ed-4d0e-addd-fb6e0d1e8df7" xlink:to="loc_lpsn_HostedServicesBusinessMember_3e331688-4a2b-46f2-88c1-d89446d226bc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_HostedServicesConsumerMember_d1d7ac26-e97f-4438-9f90-5e2c0d59ce7a" xlink:href="lpsn-20230331.xsd#lpsn_HostedServicesConsumerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_9dc00109-49ed-4d0e-addd-fb6e0d1e8df7" xlink:to="loc_lpsn_HostedServicesConsumerMember_d1d7ac26-e97f-4438-9f90-5e2c0d59ce7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ProfessionalServicesMember_c37884bb-bd24-4a14-8456-989a54dbae3e" xlink:href="lpsn-20230331.xsd#lpsn_ProfessionalServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_9dc00109-49ed-4d0e-addd-fb6e0d1e8df7" xlink:to="loc_lpsn_ProfessionalServicesMember_c37884bb-bd24-4a14-8456-989a54dbae3e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_d21429ac-ab9e-4555-98bf-27388ec21776" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_b1b69a2b-e08c-4626-809a-27e3ce5da6ff" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_d21429ac-ab9e-4555-98bf-27388ec21776" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_d21429ac-ab9e-4555-98bf-27388ec21776_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_d21429ac-ab9e-4555-98bf-27388ec21776" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_d21429ac-ab9e-4555-98bf-27388ec21776_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_c8542d61-e59d-45ef-8250-5df4a5331e56" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_d21429ac-ab9e-4555-98bf-27388ec21776" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_c8542d61-e59d-45ef-8250-5df4a5331e56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_KasambaIncMember_a737e454-8d64-4964-b665-14eae0e83be8" xlink:href="lpsn-20230331.xsd#lpsn_KasambaIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_c8542d61-e59d-45ef-8250-5df4a5331e56" xlink:to="loc_lpsn_KasambaIncMember_a737e454-8d64-4964-b665-14eae0e83be8" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/RevenueRecognitionRevenuebyGeographicLocationDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#RevenueRecognitionRevenuebyGeographicLocationDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/RevenueRecognitionRevenuebyGeographicLocationDetails" xlink:type="extended" id="i712eb778e84849e6b03ce0b0570cb579_RevenueRecognitionRevenuebyGeographicLocationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_17c3ae33-396d-415a-8e51-9b0863e9242a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_97c4b8c0-2f4e-426e-a970-ae4a5a6b149d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_17c3ae33-396d-415a-8e51-9b0863e9242a" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_97c4b8c0-2f4e-426e-a970-ae4a5a6b149d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_6b759d0e-e111-4065-a570-f6eeaf9cc690" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_17c3ae33-396d-415a-8e51-9b0863e9242a" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_6b759d0e-e111-4065-a570-f6eeaf9cc690" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_dd5d9d52-d7e9-4a6f-abf8-9c235825a015" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_6b759d0e-e111-4065-a570-f6eeaf9cc690" xlink:to="loc_srt_StatementGeographicalAxis_dd5d9d52-d7e9-4a6f-abf8-9c235825a015" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_dd5d9d52-d7e9-4a6f-abf8-9c235825a015_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_dd5d9d52-d7e9-4a6f-abf8-9c235825a015" xlink:to="loc_srt_SegmentGeographicalDomain_dd5d9d52-d7e9-4a6f-abf8-9c235825a015_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_c78b3fb5-d5be-4e57-8b1b-455facef9952" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_dd5d9d52-d7e9-4a6f-abf8-9c235825a015" xlink:to="loc_srt_SegmentGeographicalDomain_c78b3fb5-d5be-4e57-8b1b-455facef9952" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_129960d2-f98c-4bdb-9a85-bfd79a1cdbae" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_c78b3fb5-d5be-4e57-8b1b-455facef9952" xlink:to="loc_country_US_129960d2-f98c-4bdb-9a85-bfd79a1cdbae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_OtherAmericasMember_1db6ae87-440f-4eda-9d78-e022e0d9dfa6" xlink:href="lpsn-20230331.xsd#lpsn_OtherAmericasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_c78b3fb5-d5be-4e57-8b1b-455facef9952" xlink:to="loc_lpsn_OtherAmericasMember_1db6ae87-440f-4eda-9d78-e022e0d9dfa6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AmericasMember_c6db7c77-ecf5-4ba5-9397-897ceb342229" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_AmericasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_c78b3fb5-d5be-4e57-8b1b-455facef9952" xlink:to="loc_srt_AmericasMember_c6db7c77-ecf5-4ba5-9397-897ceb342229" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_03e9cb07-75c8-4c50-a3c2-bb24ebeb2f70" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EMEAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_c78b3fb5-d5be-4e57-8b1b-455facef9952" xlink:to="loc_us-gaap_EMEAMember_03e9cb07-75c8-4c50-a3c2-bb24ebeb2f70" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_exch_XPST_01a0bf13-b42c-4e43-96f8-d6620a421d18" xlink:href="https://xbrl.sec.gov/exch/2021/exch-2021.xsd#exch_XPST"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_c78b3fb5-d5be-4e57-8b1b-455facef9952" xlink:to="loc_exch_XPST_01a0bf13-b42c-4e43-96f8-d6620a421d18" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_c2511305-1bcf-4a0b-b3b8-5707d92ec5e7" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_c78b3fb5-d5be-4e57-8b1b-455facef9952" xlink:to="loc_country_GB_c2511305-1bcf-4a0b-b3b8-5707d92ec5e7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_NL_a90789f8-1948-4e9a-add0-630a3f080c94" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_NL"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_c78b3fb5-d5be-4e57-8b1b-455facef9952" xlink:to="loc_country_NL_a90789f8-1948-4e9a-add0-630a3f080c94" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/RevenueRecognitionReceivablesandDeferredRevenueDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#RevenueRecognitionReceivablesandDeferredRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/RevenueRecognitionReceivablesandDeferredRevenueDetails" xlink:type="extended" id="iaa22935ba00a4648bc173b98e7b5ee03_RevenueRecognitionReceivablesandDeferredRevenueDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_fc584968-5934-4405-b413-c8d4ef83245e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ContractBalancesRollForward_227cf521-696c-44c5-85e6-36a5b44755a2" xlink:href="lpsn-20230331.xsd#lpsn_ContractBalancesRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fc584968-5934-4405-b413-c8d4ef83245e" xlink:to="loc_lpsn_ContractBalancesRollForward_227cf521-696c-44c5-85e6-36a5b44755a2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_1d2245d9-15f0-4d5c-9498-403f38a8fb6d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_ContractBalancesRollForward_227cf521-696c-44c5-85e6-36a5b44755a2" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_1d2245d9-15f0-4d5c-9498-403f38a8fb6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_AccountsReceivablePeriodIncreaseDecreaseNet_aa577f37-c431-4944-893a-a36f7e2a54d1" xlink:href="lpsn-20230331.xsd#lpsn_AccountsReceivablePeriodIncreaseDecreaseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_ContractBalancesRollForward_227cf521-696c-44c5-85e6-36a5b44755a2" xlink:to="loc_lpsn_AccountsReceivablePeriodIncreaseDecreaseNet_aa577f37-c431-4944-893a-a36f7e2a54d1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_457baf5c-f4ea-4e72-9a42-8da6d7e030ae" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNetNoncurrent_30edb96d-ac20-4a81-b775-87782d7bbefb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalizedContractCostNetNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_ContractBalancesRollForward_227cf521-696c-44c5-85e6-36a5b44755a2" xlink:to="loc_us-gaap_CapitalizedContractCostNetNoncurrent_30edb96d-ac20-4a81-b775-87782d7bbefb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_CapitalizedContractCostsPeriodIncreaseDecreaseNet_17cc10bc-91a3-476f-919c-7177ad3cb3bc" xlink:href="lpsn-20230331.xsd#lpsn_CapitalizedContractCostsPeriodIncreaseDecreaseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_ContractBalancesRollForward_227cf521-696c-44c5-85e6-36a5b44755a2" xlink:to="loc_lpsn_CapitalizedContractCostsPeriodIncreaseDecreaseNet_17cc10bc-91a3-476f-919c-7177ad3cb3bc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNetNoncurrent_c83a4c9f-e8c1-4eec-a608-9fe78ff09bd3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalizedContractCostNetNoncurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_f0d305a4-124f-4a31-ae5d-f09943be86ea" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_ContractBalancesRollForward_227cf521-696c-44c5-85e6-36a5b44755a2" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_f0d305a4-124f-4a31-ae5d-f09943be86ea" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ContractWithCustomerLiabilityCurrentPeriodIncreaseDecreaseNet_d70a5288-ed26-4b83-9b19-d3272bc1ce89" xlink:href="lpsn-20230331.xsd#lpsn_ContractWithCustomerLiabilityCurrentPeriodIncreaseDecreaseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_ContractBalancesRollForward_227cf521-696c-44c5-85e6-36a5b44755a2" xlink:to="loc_lpsn_ContractWithCustomerLiabilityCurrentPeriodIncreaseDecreaseNet_d70a5288-ed26-4b83-9b19-d3272bc1ce89" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_56d259b1-5f07-4590-a834-4bc08de68d50" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_b16cd74c-2e96-4ba4-9bb5-deb0e21c84fc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_ContractBalancesRollForward_227cf521-696c-44c5-85e6-36a5b44755a2" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_b16cd74c-2e96-4ba4-9bb5-deb0e21c84fc" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ContractWithCustomerLiabilityNoncurrentPeriodIncreaseDecreaseNet_b363414b-4f68-486d-8dbc-485d91833c88" xlink:href="lpsn-20230331.xsd#lpsn_ContractWithCustomerLiabilityNoncurrentPeriodIncreaseDecreaseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_ContractBalancesRollForward_227cf521-696c-44c5-85e6-36a5b44755a2" xlink:to="loc_lpsn_ContractWithCustomerLiabilityNoncurrentPeriodIncreaseDecreaseNet_b363414b-4f68-486d-8dbc-485d91833c88" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_b69c44f9-3d7e-49f5-a738-801d2d0de513" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_3e8e70c6-4b42-4653-b9cc-79f92b2312ee" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fc584968-5934-4405-b413-c8d4ef83245e" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_3e8e70c6-4b42-4653-b9cc-79f92b2312ee" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis_3a6dff4d-6eef-43ca-ad29-a155829639c2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_3e8e70c6-4b42-4653-b9cc-79f92b2312ee" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis_3a6dff4d-6eef-43ca-ad29-a155829639c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesBillingStatusDomain_3a6dff4d-6eef-43ca-ad29-a155829639c2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReceivablesBillingStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis_3a6dff4d-6eef-43ca-ad29-a155829639c2" xlink:to="loc_us-gaap_ReceivablesBillingStatusDomain_3a6dff4d-6eef-43ca-ad29-a155829639c2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesBillingStatusDomain_fad58d56-6aa0-46ec-b796-34c37ecadc39" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReceivablesBillingStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis_3a6dff4d-6eef-43ca-ad29-a155829639c2" xlink:to="loc_us-gaap_ReceivablesBillingStatusDomain_fad58d56-6aa0-46ec-b796-34c37ecadc39" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BilledRevenuesMember_a8693c1e-a290-4c0f-b54e-502506012a3e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BilledRevenuesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivablesBillingStatusDomain_fad58d56-6aa0-46ec-b796-34c37ecadc39" xlink:to="loc_us-gaap_BilledRevenuesMember_a8693c1e-a290-4c0f-b54e-502506012a3e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnbilledRevenuesMember_85e7d403-bcec-444e-9460-6cfaa6227b0d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnbilledRevenuesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivablesBillingStatusDomain_fad58d56-6aa0-46ec-b796-34c37ecadc39" xlink:to="loc_us-gaap_UnbilledRevenuesMember_85e7d403-bcec-444e-9460-6cfaa6227b0d" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/RevenueRecognitionNarrativeDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#RevenueRecognitionNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/RevenueRecognitionNarrativeDetails" xlink:type="extended" id="ic1ec932bc01f4562969235647498687d_RevenueRecognitionNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_2d7a35aa-1e5d-45bb-9f04-1e7716fb2b0a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_b6ee2024-b81c-43fa-a4a0-8e03940bc54a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_2d7a35aa-1e5d-45bb-9f04-1e7716fb2b0a" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_b6ee2024-b81c-43fa-a4a0-8e03940bc54a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_RevenueRemainingPerformanceObligationPercentageToBeRecognizedInNextTwoYears_299b54c8-13df-453f-9041-64666405ff02" xlink:href="lpsn-20230331.xsd#lpsn_RevenueRemainingPerformanceObligationPercentageToBeRecognizedInNextTwoYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_2d7a35aa-1e5d-45bb-9f04-1e7716fb2b0a" xlink:to="loc_lpsn_RevenueRemainingPerformanceObligationPercentageToBeRecognizedInNextTwoYears_299b54c8-13df-453f-9041-64666405ff02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_8bf62483-fcfc-4c01-9897-fbb668031306" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_2d7a35aa-1e5d-45bb-9f04-1e7716fb2b0a" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_8bf62483-fcfc-4c01-9897-fbb668031306" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_7a65699f-77eb-4b4e-b243-cf0be73aa1bb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_2d7a35aa-1e5d-45bb-9f04-1e7716fb2b0a" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_7a65699f-77eb-4b4e-b243-cf0be73aa1bb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_95c5abac-cd51-44c9-9291-4362dab1682a" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_7a65699f-77eb-4b4e-b243-cf0be73aa1bb" xlink:to="loc_srt_RangeAxis_95c5abac-cd51-44c9-9291-4362dab1682a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_95c5abac-cd51-44c9-9291-4362dab1682a_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_95c5abac-cd51-44c9-9291-4362dab1682a" xlink:to="loc_srt_RangeMember_95c5abac-cd51-44c9-9291-4362dab1682a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_432e17f9-978d-4eb0-9325-7a81d80e6854" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_95c5abac-cd51-44c9-9291-4362dab1682a" xlink:to="loc_srt_RangeMember_432e17f9-978d-4eb0-9325-7a81d80e6854" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_76b40764-f405-4dba-83eb-5360ff0df9a9" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_432e17f9-978d-4eb0-9325-7a81d80e6854" xlink:to="loc_srt_MinimumMember_76b40764-f405-4dba-83eb-5360ff0df9a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_a4680153-49a6-4c52-840b-c3eb3819d3f3" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_432e17f9-978d-4eb0-9325-7a81d80e6854" xlink:to="loc_srt_MaximumMember_a4680153-49a6-4c52-840b-c3eb3819d3f3" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/NetLossPerShareScheduleofAntidilutiveSecuritiesExcludedfromComputationofEPSDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#NetLossPerShareScheduleofAntidilutiveSecuritiesExcludedfromComputationofEPSDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/NetLossPerShareScheduleofAntidilutiveSecuritiesExcludedfromComputationofEPSDetails" xlink:type="extended" id="ib8bac2b9fe574fef94d1669bb71addf1_NetLossPerShareScheduleofAntidilutiveSecuritiesExcludedfromComputationofEPSDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_1a7d20e4-c35c-4ad5-a114-4d714e8e4266" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_0c397590-e26c-47cd-91ea-252129ade9de" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_1a7d20e4-c35c-4ad5-a114-4d714e8e4266" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_0c397590-e26c-47cd-91ea-252129ade9de" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_b021e65e-ca8d-4964-bdcc-1e334ec652eb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_1a7d20e4-c35c-4ad5-a114-4d714e8e4266" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_b021e65e-ca8d-4964-bdcc-1e334ec652eb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_85f60949-84a2-4737-b93e-716748ea251e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_b021e65e-ca8d-4964-bdcc-1e334ec652eb" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_85f60949-84a2-4737-b93e-716748ea251e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_85f60949-84a2-4737-b93e-716748ea251e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_85f60949-84a2-4737-b93e-716748ea251e" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_85f60949-84a2-4737-b93e-716748ea251e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_eb5ca413-16a7-4184-94b8-fa510e28aa21" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_85f60949-84a2-4737-b93e-716748ea251e" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_eb5ca413-16a7-4184-94b8-fa510e28aa21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_SharesSubjectToOutstandingCommonStockOptionsAndEmployeeStockPurchasePlanMember_14386e7a-5917-42c0-abde-1a119781b242" xlink:href="lpsn-20230331.xsd#lpsn_SharesSubjectToOutstandingCommonStockOptionsAndEmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_eb5ca413-16a7-4184-94b8-fa510e28aa21" xlink:to="loc_lpsn_SharesSubjectToOutstandingCommonStockOptionsAndEmployeeStockPurchasePlanMember_14386e7a-5917-42c0-abde-1a119781b242" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_5b7e5606-b28e-42ac-94b6-4b30bd082b0f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_eb5ca413-16a7-4184-94b8-fa510e28aa21" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_5b7e5606-b28e-42ac-94b6-4b30bd082b0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtSecuritiesMember_9e8ed537-4f5e-4dc7-abb4-dad1d5ad4dd2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertibleDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_eb5ca413-16a7-4184-94b8-fa510e28aa21" xlink:to="loc_us-gaap_ConvertibleDebtSecuritiesMember_9e8ed537-4f5e-4dc7-abb4-dad1d5ad4dd2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_FairValueEarnoutMember_0ba10491-8130-44ba-9991-d1cbe68b81c0" xlink:href="lpsn-20230331.xsd#lpsn_FairValueEarnoutMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_eb5ca413-16a7-4184-94b8-fa510e28aa21" xlink:to="loc_lpsn_FairValueEarnoutMember_0ba10491-8130-44ba-9991-d1cbe68b81c0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_6626c620-18dd-422e-8103-1a7b75c50c23" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_b021e65e-ca8d-4964-bdcc-1e334ec652eb" xlink:to="loc_us-gaap_DebtInstrumentAxis_6626c620-18dd-422e-8103-1a7b75c50c23" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_6626c620-18dd-422e-8103-1a7b75c50c23_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_6626c620-18dd-422e-8103-1a7b75c50c23" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_6626c620-18dd-422e-8103-1a7b75c50c23_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_5a670756-33bf-4c94-95e1-9436c8c01915" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_6626c620-18dd-422e-8103-1a7b75c50c23" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_5a670756-33bf-4c94-95e1-9436c8c01915" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesDue2024Member_778d893b-90f4-42e8-aacc-1627619608d8" xlink:href="lpsn-20230331.xsd#lpsn_ConvertibleSeniorNotesDue2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_5a670756-33bf-4c94-95e1-9436c8c01915" xlink:to="loc_lpsn_ConvertibleSeniorNotesDue2024Member_778d893b-90f4-42e8-aacc-1627619608d8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesDue2026Member_4e5655b4-4229-4c1f-9dd7-5786919586cf" xlink:href="lpsn-20230331.xsd#lpsn_ConvertibleSeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_5a670756-33bf-4c94-95e1-9436c8c01915" xlink:to="loc_lpsn_ConvertibleSeniorNotesDue2026Member_4e5655b4-4229-4c1f-9dd7-5786919586cf" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/NetLossPerShareNarrativeDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#NetLossPerShareNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/NetLossPerShareNarrativeDetails" xlink:type="extended" id="iff083c2057c743e5a937ab25c76fbcbc_NetLossPerShareNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_b2631b67-de4f-4a0e-8d9d-160b909fa3ec" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_f5e8ff6b-0791-40e2-98f3-dfc8ce043a91" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_b2631b67-de4f-4a0e-8d9d-160b909fa3ec" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_f5e8ff6b-0791-40e2-98f3-dfc8ce043a91" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_3ee46bad-32ff-44c8-85c3-3ec69029b9ae" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_b2631b67-de4f-4a0e-8d9d-160b909fa3ec" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_3ee46bad-32ff-44c8-85c3-3ec69029b9ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_bd8f38b5-4927-46d6-b87c-3769882aaec6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_b2631b67-de4f-4a0e-8d9d-160b909fa3ec" xlink:to="loc_us-gaap_DebtInstrumentTable_bd8f38b5-4927-46d6-b87c-3769882aaec6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_813bd5cd-61b2-4e33-82bb-d32bdfd4534d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_bd8f38b5-4927-46d6-b87c-3769882aaec6" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_813bd5cd-61b2-4e33-82bb-d32bdfd4534d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_813bd5cd-61b2-4e33-82bb-d32bdfd4534d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_813bd5cd-61b2-4e33-82bb-d32bdfd4534d" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_813bd5cd-61b2-4e33-82bb-d32bdfd4534d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_98a02797-5421-401c-bee8-7909155ab171" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_813bd5cd-61b2-4e33-82bb-d32bdfd4534d" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_98a02797-5421-401c-bee8-7909155ab171" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_09d14c60-4e92-429c-aa9b-b2d9986b423e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_98a02797-5421-401c-bee8-7909155ab171" xlink:to="loc_us-gaap_ConvertibleDebtMember_09d14c60-4e92-429c-aa9b-b2d9986b423e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_cb9ea44c-3ffe-464a-b2d7-e730b266cf0a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_bd8f38b5-4927-46d6-b87c-3769882aaec6" xlink:to="loc_us-gaap_DebtInstrumentAxis_cb9ea44c-3ffe-464a-b2d7-e730b266cf0a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_cb9ea44c-3ffe-464a-b2d7-e730b266cf0a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_cb9ea44c-3ffe-464a-b2d7-e730b266cf0a" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_cb9ea44c-3ffe-464a-b2d7-e730b266cf0a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_cbc68d6f-d6ab-4c59-9128-fb5af86b1289" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_cb9ea44c-3ffe-464a-b2d7-e730b266cf0a" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_cbc68d6f-d6ab-4c59-9128-fb5af86b1289" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesDue2024Member_1538f4a6-f5b8-4454-87cb-c340d22d598c" xlink:href="lpsn-20230331.xsd#lpsn_ConvertibleSeniorNotesDue2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc68d6f-d6ab-4c59-9128-fb5af86b1289" xlink:to="loc_lpsn_ConvertibleSeniorNotesDue2024Member_1538f4a6-f5b8-4454-87cb-c340d22d598c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesDue2026Member_7c5ed033-af7d-4a2b-901e-9fe6a226034f" xlink:href="lpsn-20230331.xsd#lpsn_ConvertibleSeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc68d6f-d6ab-4c59-9128-fb5af86b1289" xlink:to="loc_lpsn_ConvertibleSeniorNotesDue2026Member_7c5ed033-af7d-4a2b-901e-9fe6a226034f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/SegmentInformationFinancialInformationbySegmentDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#SegmentInformationFinancialInformationbySegmentDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/SegmentInformationFinancialInformationbySegmentDetails" xlink:type="extended" id="ibaa34ccca6af49f1969d012df3d0dffb_SegmentInformationFinancialInformationbySegmentDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_7ab30ad0-0882-4144-baf3-22a8f612a96d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_acbeba68-4c5a-4105-a427-57c32b9fcd9e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7ab30ad0-0882-4144-baf3-22a8f612a96d" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_acbeba68-4c5a-4105-a427-57c32b9fcd9e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenue_73b0cc79-544b-4bef-b25c-ca72618aef94" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostOfRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7ab30ad0-0882-4144-baf3-22a8f612a96d" xlink:to="loc_us-gaap_CostOfRevenue_73b0cc79-544b-4bef-b25c-ca72618aef94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpense_b043252b-dd43-4f05-bc15-5ea96cfc7458" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SellingAndMarketingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7ab30ad0-0882-4144-baf3-22a8f612a96d" xlink:to="loc_us-gaap_SellingAndMarketingExpense_b043252b-dd43-4f05-bc15-5ea96cfc7458" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_AmortizationofIntangibleAssetsNonproduction_0e051512-79bc-4853-b4c8-570c56170ef2" xlink:href="lpsn-20230331.xsd#lpsn_AmortizationofIntangibleAssetsNonproduction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7ab30ad0-0882-4144-baf3-22a8f612a96d" xlink:to="loc_lpsn_AmortizationofIntangibleAssetsNonproduction_0e051512-79bc-4853-b4c8-570c56170ef2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_GainOnDivestiture_f55e6b4d-5db1-42b4-9131-956125a5fa13" xlink:href="lpsn-20230331.xsd#lpsn_GainOnDivestiture"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7ab30ad0-0882-4144-baf3-22a8f612a96d" xlink:to="loc_lpsn_GainOnDivestiture_f55e6b4d-5db1-42b4-9131-956125a5fa13" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_SegmentReportingUnallocatedCorporateExpenses_f566fe3b-f557-4adc-b5a9-71c00ea4f48d" xlink:href="lpsn-20230331.xsd#lpsn_SegmentReportingUnallocatedCorporateExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7ab30ad0-0882-4144-baf3-22a8f612a96d" xlink:to="loc_lpsn_SegmentReportingUnallocatedCorporateExpenses_f566fe3b-f557-4adc-b5a9-71c00ea4f48d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_d54cdc9b-b339-411a-a0b4-05daf1f5b673" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7ab30ad0-0882-4144-baf3-22a8f612a96d" xlink:to="loc_us-gaap_OperatingIncomeLoss_d54cdc9b-b339-411a-a0b4-05daf1f5b673" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_97e4fcef-e667-4430-a9b8-47f2d33ab2f5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7ab30ad0-0882-4144-baf3-22a8f612a96d" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_97e4fcef-e667-4430-a9b8-47f2d33ab2f5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_799853df-99e2-4a8b-b5fd-0583fcab0697" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_97e4fcef-e667-4430-a9b8-47f2d33ab2f5" xlink:to="loc_srt_ProductOrServiceAxis_799853df-99e2-4a8b-b5fd-0583fcab0697" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_799853df-99e2-4a8b-b5fd-0583fcab0697_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_799853df-99e2-4a8b-b5fd-0583fcab0697" xlink:to="loc_srt_ProductsAndServicesDomain_799853df-99e2-4a8b-b5fd-0583fcab0697_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_20cec808-9a92-4b08-a101-09bc61aedf04" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_799853df-99e2-4a8b-b5fd-0583fcab0697" xlink:to="loc_srt_ProductsAndServicesDomain_20cec808-9a92-4b08-a101-09bc61aedf04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_HostedServicesBusinessMember_700690c8-ac44-45d4-a2a0-d0841f6c3e4b" xlink:href="lpsn-20230331.xsd#lpsn_HostedServicesBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_20cec808-9a92-4b08-a101-09bc61aedf04" xlink:to="loc_lpsn_HostedServicesBusinessMember_700690c8-ac44-45d4-a2a0-d0841f6c3e4b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_HostedServicesConsumerMember_50a4a7c6-e8c3-4c2d-ab07-f35086a94412" xlink:href="lpsn-20230331.xsd#lpsn_HostedServicesConsumerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_20cec808-9a92-4b08-a101-09bc61aedf04" xlink:to="loc_lpsn_HostedServicesConsumerMember_50a4a7c6-e8c3-4c2d-ab07-f35086a94412" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ProfessionalServicesMember_3c855f7f-36ed-4f81-912e-656fc5d54e1d" xlink:href="lpsn-20230331.xsd#lpsn_ProfessionalServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_20cec808-9a92-4b08-a101-09bc61aedf04" xlink:to="loc_lpsn_ProfessionalServicesMember_3c855f7f-36ed-4f81-912e-656fc5d54e1d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_003a93f6-ec00-4187-aa5d-fe7a34538451" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_97e4fcef-e667-4430-a9b8-47f2d33ab2f5" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_003a93f6-ec00-4187-aa5d-fe7a34538451" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_003a93f6-ec00-4187-aa5d-fe7a34538451_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_003a93f6-ec00-4187-aa5d-fe7a34538451" xlink:to="loc_us-gaap_SegmentDomain_003a93f6-ec00-4187-aa5d-fe7a34538451_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_ed16b793-b7ed-49e1-a269-4519e4c7bd49" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_003a93f6-ec00-4187-aa5d-fe7a34538451" xlink:to="loc_us-gaap_SegmentDomain_ed16b793-b7ed-49e1-a269-4519e4c7bd49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_BusinessMember_dbedfb48-3e97-4fdd-a5cc-83f0eb37760c" xlink:href="lpsn-20230331.xsd#lpsn_BusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ed16b793-b7ed-49e1-a269-4519e4c7bd49" xlink:to="loc_lpsn_BusinessMember_dbedfb48-3e97-4fdd-a5cc-83f0eb37760c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_4a8445dd-de4e-45bf-a169-db34622bdd4b" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_97e4fcef-e667-4430-a9b8-47f2d33ab2f5" xlink:to="loc_srt_ConsolidationItemsAxis_4a8445dd-de4e-45bf-a169-db34622bdd4b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_4a8445dd-de4e-45bf-a169-db34622bdd4b_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_4a8445dd-de4e-45bf-a169-db34622bdd4b" xlink:to="loc_srt_ConsolidationItemsDomain_4a8445dd-de4e-45bf-a169-db34622bdd4b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_0bd1212f-155c-4a11-88cb-4715a511c3b7" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_4a8445dd-de4e-45bf-a169-db34622bdd4b" xlink:to="loc_srt_ConsolidationItemsDomain_0bd1212f-155c-4a11-88cb-4715a511c3b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_053d4785-271b-40dc-b339-a573a1c6a0b7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_0bd1212f-155c-4a11-88cb-4715a511c3b7" xlink:to="loc_us-gaap_OperatingSegmentsMember_053d4785-271b-40dc-b339-a573a1c6a0b7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_829ba86d-7efc-4bbc-85a3-5c90e73a39df" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_0bd1212f-155c-4a11-88cb-4715a511c3b7" xlink:to="loc_us-gaap_CorporateNonSegmentMember_829ba86d-7efc-4bbc-85a3-5c90e73a39df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_a5486275-e4f8-4822-9c7c-45f7a41797b9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_97e4fcef-e667-4430-a9b8-47f2d33ab2f5" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_a5486275-e4f8-4822-9c7c-45f7a41797b9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_a5486275-e4f8-4822-9c7c-45f7a41797b9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_a5486275-e4f8-4822-9c7c-45f7a41797b9" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_a5486275-e4f8-4822-9c7c-45f7a41797b9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_109d5039-81eb-4552-9d5c-bbf98cdcef6e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_a5486275-e4f8-4822-9c7c-45f7a41797b9" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_109d5039-81eb-4552-9d5c-bbf98cdcef6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_KasambaIncMember_13044efa-e58f-4f48-a6e0-7ffce8c61d6a" xlink:href="lpsn-20230331.xsd#lpsn_KasambaIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_109d5039-81eb-4552-9d5c-bbf98cdcef6e" xlink:to="loc_lpsn_KasambaIncMember_13044efa-e58f-4f48-a6e0-7ffce8c61d6a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/SegmentInformationLongLivedAssetsbyGeographicRegionDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#SegmentInformationLongLivedAssetsbyGeographicRegionDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/SegmentInformationLongLivedAssetsbyGeographicRegionDetails" xlink:type="extended" id="ib384b98dc5e24210aa8bdc367583d320_SegmentInformationLongLivedAssetsbyGeographicRegionDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_2c45c531-5924-4622-9d7a-6668d3e8f6a8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncurrentAssets_4a732644-cfe2-4714-878b-69b3fc76ea32" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_2c45c531-5924-4622-9d7a-6668d3e8f6a8" xlink:to="loc_us-gaap_NoncurrentAssets_4a732644-cfe2-4714-878b-69b3fc76ea32" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_ad4aad0b-0d54-400a-8d6e-db678a75fd23" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_2c45c531-5924-4622-9d7a-6668d3e8f6a8" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_ad4aad0b-0d54-400a-8d6e-db678a75fd23" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_56b1cd6a-d626-492b-85cd-57a9a135f448" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_ad4aad0b-0d54-400a-8d6e-db678a75fd23" xlink:to="loc_srt_StatementGeographicalAxis_56b1cd6a-d626-492b-85cd-57a9a135f448" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_56b1cd6a-d626-492b-85cd-57a9a135f448_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_56b1cd6a-d626-492b-85cd-57a9a135f448" xlink:to="loc_srt_SegmentGeographicalDomain_56b1cd6a-d626-492b-85cd-57a9a135f448_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_1afaad48-938f-4676-9848-09e9065ad4e3" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_56b1cd6a-d626-492b-85cd-57a9a135f448" xlink:to="loc_srt_SegmentGeographicalDomain_1afaad48-938f-4676-9848-09e9065ad4e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_6a6359c7-a346-40ec-a4bf-0dd3b99191b0" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_1afaad48-938f-4676-9848-09e9065ad4e3" xlink:to="loc_country_US_6a6359c7-a346-40ec-a4bf-0dd3b99191b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_DE_bf70d1fc-2e1b-4f38-8310-4eb2d1c37b24" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_DE"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_1afaad48-938f-4676-9848-09e9065ad4e3" xlink:to="loc_country_DE_bf70d1fc-2e1b-4f38-8310-4eb2d1c37b24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_IL_2b370823-06c2-4c5a-9327-2617eb3e9ca9" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_IL"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_1afaad48-938f-4676-9848-09e9065ad4e3" xlink:to="loc_country_IL_2b370823-06c2-4c5a-9327-2617eb3e9ca9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_AU_034b52c7-8bee-4e9f-a349-90c98562ac80" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_AU"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_1afaad48-938f-4676-9848-09e9065ad4e3" xlink:to="loc_country_AU_034b52c7-8bee-4e9f-a349-90c98562ac80" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_NL_1867b5d4-6d29-4cfd-9d5c-dba91cb63136" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_NL"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_1afaad48-938f-4676-9848-09e9065ad4e3" xlink:to="loc_country_NL_1867b5d4-6d29-4cfd-9d5c-dba91cb63136" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_UnitedKingdomGermanyJapanFranceItalyMember_681f54dc-6085-4394-a793-13f799120f1d" xlink:href="lpsn-20230331.xsd#lpsn_UnitedKingdomGermanyJapanFranceItalyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_1afaad48-938f-4676-9848-09e9065ad4e3" xlink:to="loc_lpsn_UnitedKingdomGermanyJapanFranceItalyMember_681f54dc-6085-4394-a793-13f799120f1d" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/GoodwillandIntangibleAssetsChangesinCarryingAmountofGoodwillDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#GoodwillandIntangibleAssetsChangesinCarryingAmountofGoodwillDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/GoodwillandIntangibleAssetsChangesinCarryingAmountofGoodwillDetails" xlink:type="extended" id="i1cd57ea46d434b9b85062d7a13faee8c_GoodwillandIntangibleAssetsChangesinCarryingAmountofGoodwillDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_4c667280-163b-4ea8-a6d5-de60519f3c7b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_f6f08536-fea8-44b4-85d9-30b620dc084f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_4c667280-163b-4ea8-a6d5-de60519f3c7b" xlink:to="loc_us-gaap_GoodwillRollForward_f6f08536-fea8-44b4-85d9-30b620dc084f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_24373346-edcb-4790-900c-35abd3a8dcbb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_f6f08536-fea8-44b4-85d9-30b620dc084f" xlink:to="loc_us-gaap_Goodwill_24373346-edcb-4790-900c-35abd3a8dcbb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_16301121-232d-49f4-bbed-81b13faa55c4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_f6f08536-fea8-44b4-85d9-30b620dc084f" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_16301121-232d-49f4-bbed-81b13faa55c4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_569fbdab-f2be-4c2d-94ef-e5a2a56085dc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_1c78a9c1-b85c-4731-989d-0ff65650b878" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_4c667280-163b-4ea8-a6d5-de60519f3c7b" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_1c78a9c1-b85c-4731-989d-0ff65650b878" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_ca4741d7-4a82-46fd-af27-b52023225813" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_1c78a9c1-b85c-4731-989d-0ff65650b878" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_ca4741d7-4a82-46fd-af27-b52023225813" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_ca4741d7-4a82-46fd-af27-b52023225813_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_ca4741d7-4a82-46fd-af27-b52023225813" xlink:to="loc_us-gaap_SegmentDomain_ca4741d7-4a82-46fd-af27-b52023225813_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_20113210-8204-4ffd-ae43-7998991dd5ca" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_ca4741d7-4a82-46fd-af27-b52023225813" xlink:to="loc_us-gaap_SegmentDomain_20113210-8204-4ffd-ae43-7998991dd5ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_BusinessMember_bce7be08-1264-42a6-b4ef-a0c6217e8237" xlink:href="lpsn-20230331.xsd#lpsn_BusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_20113210-8204-4ffd-ae43-7998991dd5ca" xlink:to="loc_lpsn_BusinessMember_bce7be08-1264-42a6-b4ef-a0c6217e8237" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/GoodwillandIntangibleAssetsIntangibleAssetsDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#GoodwillandIntangibleAssetsIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/GoodwillandIntangibleAssetsIntangibleAssetsDetails" xlink:type="extended" id="id4f6efd37efa4314a45459c7d353c7e7_GoodwillandIntangibleAssetsIntangibleAssetsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_61501830-d5c3-43f1-9818-989341ffc4ef" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_2a6ecfed-945e-4f8f-aa09-b30b1fb43c6e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_61501830-d5c3-43f1-9818-989341ffc4ef" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_2a6ecfed-945e-4f8f-aa09-b30b1fb43c6e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_c65c5bdd-cfd7-4b58-b84d-2c22f332cf43" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_61501830-d5c3-43f1-9818-989341ffc4ef" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_c65c5bdd-cfd7-4b58-b84d-2c22f332cf43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_ebb56079-f913-4a83-b85b-6d90b3dbe8d3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_61501830-d5c3-43f1-9818-989341ffc4ef" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_ebb56079-f913-4a83-b85b-6d90b3dbe8d3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_f569be59-5ec8-4662-9a79-6b6d213c7708" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_61501830-d5c3-43f1-9818-989341ffc4ef" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_f569be59-5ec8-4662-9a79-6b6d213c7708" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_8e4c3292-b4ee-4f6d-a85a-4bce4ece7f48" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_61501830-d5c3-43f1-9818-989341ffc4ef" xlink:to="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_8e4c3292-b4ee-4f6d-a85a-4bce4ece7f48" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_35895d11-4b7b-416a-aaf1-ba2920fab443" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_8e4c3292-b4ee-4f6d-a85a-4bce4ece7f48" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_35895d11-4b7b-416a-aaf1-ba2920fab443" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_35895d11-4b7b-416a-aaf1-ba2920fab443_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_35895d11-4b7b-416a-aaf1-ba2920fab443" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_35895d11-4b7b-416a-aaf1-ba2920fab443_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9e645f6e-e302-4276-9340-5b6a5b298929" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_35895d11-4b7b-416a-aaf1-ba2920fab443" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9e645f6e-e302-4276-9340-5b6a5b298929" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_TechnologyMember_976ac59b-3e10-4fda-9822-3208bfa47985" xlink:href="lpsn-20230331.xsd#lpsn_TechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9e645f6e-e302-4276-9340-5b6a5b298929" xlink:to="loc_lpsn_TechnologyMember_976ac59b-3e10-4fda-9822-3208bfa47985" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerContractsMember_9f7124ce-0e17-4be0-a69f-5d577d5d4e5a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CustomerContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9e645f6e-e302-4276-9340-5b6a5b298929" xlink:to="loc_us-gaap_CustomerContractsMember_9f7124ce-0e17-4be0-a69f-5d577d5d4e5a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PatentsMember_47a797ec-3195-4bc8-b664-b448a263959a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PatentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9e645f6e-e302-4276-9340-5b6a5b298929" xlink:to="loc_us-gaap_PatentsMember_47a797ec-3195-4bc8-b664-b448a263959a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksMember_539e6c72-a6dd-4623-ab7e-6f446d048e93" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TrademarksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9e645f6e-e302-4276-9340-5b6a5b298929" xlink:to="loc_us-gaap_TrademarksMember_539e6c72-a6dd-4623-ab7e-6f446d048e93" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_5a0e3b21-a653-4f00-b892-167bfefac62f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9e645f6e-e302-4276-9340-5b6a5b298929" xlink:to="loc_us-gaap_TradeNamesMember_5a0e3b21-a653-4f00-b892-167bfefac62f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_be29cde6-c807-45c7-bc68-4ff4fcf6c557" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9e645f6e-e302-4276-9340-5b6a5b298929" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_be29cde6-c807-45c7-bc68-4ff4fcf6c557" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/GoodwillandIntangibleAssetsNarrativeDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#GoodwillandIntangibleAssetsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/GoodwillandIntangibleAssetsNarrativeDetails" xlink:type="extended" id="ic6b09850f2e845b7a7629333b8c173c9_GoodwillandIntangibleAssetsNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_10ada7d9-3652-43b1-b596-d548f40ece3b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1_7e13e936-3214-47eb-8341-64abcdde46da" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_10ada7d9-3652-43b1-b596-d548f40ece3b" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1_7e13e936-3214-47eb-8341-64abcdde46da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSoldAmortization_b2e19d9d-8cc2-44ac-b6ce-94776f190d15" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostOfGoodsAndServicesSoldAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_10ada7d9-3652-43b1-b596-d548f40ece3b" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSoldAmortization_b2e19d9d-8cc2-44ac-b6ce-94776f190d15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_2382f0ac-db5c-4a7a-9dfa-b4287118899f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_10ada7d9-3652-43b1-b596-d548f40ece3b" xlink:to="loc_us-gaap_RestructuringCharges_2382f0ac-db5c-4a7a-9dfa-b4287118899f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_ee3d874f-8e75-403d-a767-ce6a0ff5e5bc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_10ada7d9-3652-43b1-b596-d548f40ece3b" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_ee3d874f-8e75-403d-a767-ce6a0ff5e5bc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_136aea5a-4446-4b1c-8dbe-44751e8487d9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_ee3d874f-8e75-403d-a767-ce6a0ff5e5bc" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_136aea5a-4446-4b1c-8dbe-44751e8487d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_136aea5a-4446-4b1c-8dbe-44751e8487d9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_136aea5a-4446-4b1c-8dbe-44751e8487d9" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_136aea5a-4446-4b1c-8dbe-44751e8487d9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_316e604e-a76f-40fd-8b51-437729d29710" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_136aea5a-4446-4b1c-8dbe-44751e8487d9" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_316e604e-a76f-40fd-8b51-437729d29710" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_KasambaIncMember_fdf2636e-0a80-49aa-a7e8-1d33caf19cd4" xlink:href="lpsn-20230331.xsd#lpsn_KasambaIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_316e604e-a76f-40fd-8b51-437729d29710" xlink:to="loc_lpsn_KasambaIncMember_fdf2636e-0a80-49aa-a7e8-1d33caf19cd4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_22fe8060-4dfc-4060-9de8-2bc4768322ee" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_ee3d874f-8e75-403d-a767-ce6a0ff5e5bc" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_22fe8060-4dfc-4060-9de8-2bc4768322ee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_22fe8060-4dfc-4060-9de8-2bc4768322ee_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_22fe8060-4dfc-4060-9de8-2bc4768322ee" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_22fe8060-4dfc-4060-9de8-2bc4768322ee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_cd63834f-0424-4422-9db5-4f7d332e1ce5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_22fe8060-4dfc-4060-9de8-2bc4768322ee" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_cd63834f-0424-4422-9db5-4f7d332e1ce5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_d4969c57-61a4-4d01-8b21-b5d2e1ab8b8e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_cd63834f-0424-4422-9db5-4f7d332e1ce5" xlink:to="loc_us-gaap_CostOfSalesMember_d4969c57-61a4-4d01-8b21-b5d2e1ab8b8e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/PropertyandEquipmentDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#PropertyandEquipmentDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/PropertyandEquipmentDetails" xlink:type="extended" id="i602983ba001b4f2e8dc8640c1039b414_PropertyandEquipmentDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_6befefc7-f0f4-470c-b0a0-d8575ab35c32" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNetByTypeAbstract_e23035db-3619-49dc-881b-0a7e492b7055" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNetByTypeAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_6befefc7-f0f4-470c-b0a0-d8575ab35c32" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNetByTypeAbstract_e23035db-3619-49dc-881b-0a7e492b7055" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_9efd17c7-b4f6-42d4-9eea-0861d6f38e93" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetByTypeAbstract_e23035db-3619-49dc-881b-0a7e492b7055" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_9efd17c7-b4f6-42d4-9eea-0861d6f38e93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_05e21276-8107-4773-b71d-da63c70861b3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetByTypeAbstract_e23035db-3619-49dc-881b-0a7e492b7055" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_05e21276-8107-4773-b71d-da63c70861b3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_3c5a67cd-c795-45e6-b0de-0b4b2baad49c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetByTypeAbstract_e23035db-3619-49dc-881b-0a7e492b7055" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_3c5a67cd-c795-45e6-b0de-0b4b2baad49c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_47817cfb-5297-45a5-9fdc-6c85172283fd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetByTypeAbstract_e23035db-3619-49dc-881b-0a7e492b7055" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_47817cfb-5297-45a5-9fdc-6c85172283fd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_3db5e6db-d771-476d-9779-e57ac3b4f52e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetByTypeAbstract_e23035db-3619-49dc-881b-0a7e492b7055" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_3db5e6db-d771-476d-9779-e57ac3b4f52e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsHeldForSaleNotPartOfDisposalGroup_d58b1ff8-b367-4746-875c-28ee6a8e7030" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsHeldForSaleNotPartOfDisposalGroup"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetByTypeAbstract_e23035db-3619-49dc-881b-0a7e492b7055" xlink:to="loc_us-gaap_AssetsHeldForSaleNotPartOfDisposalGroup_d58b1ff8-b367-4746-875c-28ee6a8e7030" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortizationAndAssetsHeldForSale_50c09f90-f33c-408c-bc8c-d3f2e67b4e04" xlink:href="lpsn-20230331.xsd#lpsn_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortizationAndAssetsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetByTypeAbstract_e23035db-3619-49dc-881b-0a7e492b7055" xlink:to="loc_lpsn_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortizationAndAssetsHeldForSale_50c09f90-f33c-408c-bc8c-d3f2e67b4e04" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_aad25dda-aef0-4f95-ad4e-3a742dd1b696" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_6befefc7-f0f4-470c-b0a0-d8575ab35c32" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_aad25dda-aef0-4f95-ad4e-3a742dd1b696" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_f6cedf7d-e97f-4bd1-8397-a99d2b2f410c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_aad25dda-aef0-4f95-ad4e-3a742dd1b696" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_f6cedf7d-e97f-4bd1-8397-a99d2b2f410c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f6cedf7d-e97f-4bd1-8397-a99d2b2f410c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_f6cedf7d-e97f-4bd1-8397-a99d2b2f410c" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f6cedf7d-e97f-4bd1-8397-a99d2b2f410c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f91af8a4-d595-411c-b19d-181a841eb563" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_f6cedf7d-e97f-4bd1-8397-a99d2b2f410c" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f91af8a4-d595-411c-b19d-181a841eb563" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ComputerEquipmentAndSoftwareMember_72f193d6-ac94-451d-a169-5add732029ec" xlink:href="lpsn-20230331.xsd#lpsn_ComputerEquipmentAndSoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f91af8a4-d595-411c-b19d-181a841eb563" xlink:to="loc_lpsn_ComputerEquipmentAndSoftwareMember_72f193d6-ac94-451d-a169-5add732029ec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareDevelopmentMember_5c9c6019-9bf6-41a3-9764-68160aa6ec18" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SoftwareDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f91af8a4-d595-411c-b19d-181a841eb563" xlink:to="loc_us-gaap_SoftwareDevelopmentMember_5c9c6019-9bf6-41a3-9764-68160aa6ec18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_FurnitureEquipmentAndBuildingImprovementsMember_dc3d71de-bd88-418e-acfa-d5612c44d999" xlink:href="lpsn-20230331.xsd#lpsn_FurnitureEquipmentAndBuildingImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f91af8a4-d595-411c-b19d-181a841eb563" xlink:to="loc_lpsn_FurnitureEquipmentAndBuildingImprovementsMember_dc3d71de-bd88-418e-acfa-d5612c44d999" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/ConvertibleSeniorNotesandCappedCallTransactionsNarrativeDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#ConvertibleSeniorNotesandCappedCallTransactionsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/ConvertibleSeniorNotesandCappedCallTransactionsNarrativeDetails" xlink:type="extended" id="ib3dacdee6ece4bf3ae60827a40f5af88_ConvertibleSeniorNotesandCappedCallTransactionsNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_be385d2b-e896-42c7-afb5-d20520afcc44" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_be385d2b-e896-42c7-afb5-d20520afcc44" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_f6c09a18-ce7b-449a-9fc9-856205bc35f9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_f6c09a18-ce7b-449a-9fc9-856205bc35f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_3e0d5ee0-9db0-4579-b1e4-4c8da7fc108b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromDebtNetOfIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_3e0d5ee0-9db0-4579-b1e4-4c8da7fc108b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DebtInstrumentUnitOfPrincipalForConversionAmount_8588f5db-3a3d-4ebd-bc1f-4951a3c14e42" xlink:href="lpsn-20230331.xsd#lpsn_DebtInstrumentUnitOfPrincipalForConversionAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_lpsn_DebtInstrumentUnitOfPrincipalForConversionAmount_8588f5db-3a3d-4ebd-bc1f-4951a3c14e42" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DebtInstrumentConvertibleNumberofEquityInstrumentsPer1000Principal_49114db4-11df-4f1c-870b-f4df9cacac0c" xlink:href="lpsn-20230331.xsd#lpsn_DebtInstrumentConvertibleNumberofEquityInstrumentsPer1000Principal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_lpsn_DebtInstrumentConvertibleNumberofEquityInstrumentsPer1000Principal_49114db4-11df-4f1c-870b-f4df9cacac0c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_65f0b12d-359b-456c-9e15-c9b13684273a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_65f0b12d-359b-456c-9e15-c9b13684273a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_29cad84f-2a33-4975-a474-21e0d0ebb85c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_29cad84f-2a33-4975-a474-21e0d0ebb85c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_9434ef7d-27eb-437b-8e6e-1dccacd2e8c8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_9434ef7d-27eb-437b-8e6e-1dccacd2e8c8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_04c851c9-2d0f-4b52-9347-1da857b5ef3d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentConvertibleThresholdTradingDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_04c851c9-2d0f-4b52-9347-1da857b5ef3d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_89f3ec64-0a80-43da-a32a-f99bef495656" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_89f3ec64-0a80-43da-a32a-f99bef495656" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_670bbfd6-fe85-4255-818e-f6860d5ab4c3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_670bbfd6-fe85-4255-818e-f6860d5ab4c3" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DebtInstrumentConvertibleFiveDayPeriodThresholdOfProductOfSalePriceOfStockAndConversionRate_c84a3e63-35cd-4070-8734-d7ff2bac7093" xlink:href="lpsn-20230331.xsd#lpsn_DebtInstrumentConvertibleFiveDayPeriodThresholdOfProductOfSalePriceOfStockAndConversionRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_lpsn_DebtInstrumentConvertibleFiveDayPeriodThresholdOfProductOfSalePriceOfStockAndConversionRate_c84a3e63-35cd-4070-8734-d7ff2bac7093" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent_38605c74-ac38-46c5-a542-d5cc6a5a39e3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent_38605c74-ac38-46c5-a542-d5cc6a5a39e3" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DeferredFinanceCostsLiabilityAndEquityComponent_3875288f-27b9-4b33-9cca-aa3b0f89b699" xlink:href="lpsn-20230331.xsd#lpsn_DeferredFinanceCostsLiabilityAndEquityComponent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_lpsn_DeferredFinanceCostsLiabilityAndEquityComponent_3875288f-27b9-4b33-9cca-aa3b0f89b699" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsGross_1fdb1489-c5d9-4e25-aceb-0050f6f90b60" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredFinanceCostsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_us-gaap_DeferredFinanceCostsGross_1fdb1489-c5d9-4e25-aceb-0050f6f90b60" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleRemainingDiscountAmortizationPeriod1_1dca6c62-a815-4e0c-a1be-365f00f1a5f2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentConvertibleRemainingDiscountAmortizationPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_us-gaap_DebtInstrumentConvertibleRemainingDiscountAmortizationPeriod1_1dca6c62-a815-4e0c-a1be-365f00f1a5f2" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_a42900b4-90da-4db4-b6b8-27b68631a680" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_a42900b4-90da-4db4-b6b8-27b68631a680" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_60d784e5-ad0a-42a2-964a-45d46b77a4c7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestExpenseDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_us-gaap_InterestExpenseDebt_60d784e5-ad0a-42a2-964a-45d46b77a4c7" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_CappedCallsInitialOptionStrikePrice_6debcba3-cb26-46c7-87d3-bc6769aabf14" xlink:href="lpsn-20230331.xsd#lpsn_CappedCallsInitialOptionStrikePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_lpsn_CappedCallsInitialOptionStrikePrice_6debcba3-cb26-46c7-87d3-bc6769aabf14" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_CappedCallsInitialCapPrice_12b04aed-8d3b-43a8-9820-3b0fd74ed57b" xlink:href="lpsn-20230331.xsd#lpsn_CappedCallsInitialCapPrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_lpsn_CappedCallsInitialCapPrice_12b04aed-8d3b-43a8-9820-3b0fd74ed57b" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_NumberOfSharesOfCommonStockCoveredByCappedCalls_436751e8-a016-4fba-8dca-725cb38f8c18" xlink:href="lpsn-20230331.xsd#lpsn_NumberOfSharesOfCommonStockCoveredByCappedCalls"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_lpsn_NumberOfSharesOfCommonStockCoveredByCappedCalls_436751e8-a016-4fba-8dca-725cb38f8c18" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_AdjustmentstoAdditionalPaidinCapitalCappedCallOptionIssuanceCosts_c25e636b-d5ff-47d3-8dad-19119dc69fa0" xlink:href="lpsn-20230331.xsd#lpsn_AdjustmentstoAdditionalPaidinCapitalCappedCallOptionIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_lpsn_AdjustmentstoAdditionalPaidinCapitalCappedCallOptionIssuanceCosts_c25e636b-d5ff-47d3-8dad-19119dc69fa0" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_AdjustmentstoAdditionalPaidinCapitalDebtConversionOptionIssuanceCosts_6a260d26-b351-48bf-aedf-570f7f3d9bc7" xlink:href="lpsn-20230331.xsd#lpsn_AdjustmentstoAdditionalPaidinCapitalDebtConversionOptionIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_lpsn_AdjustmentstoAdditionalPaidinCapitalDebtConversionOptionIssuanceCosts_6a260d26-b351-48bf-aedf-570f7f3d9bc7" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleLongTermNotesPayable_15881fe0-b191-4cfe-9af0-0822367080c2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertibleLongTermNotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_us-gaap_ConvertibleLongTermNotesPayable_15881fe0-b191-4cfe-9af0-0822367080c2" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_1d66549c-73e0-4df5-b127-992b55f1c443" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_1d66549c-73e0-4df5-b127-992b55f1c443" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtExtinguishmentCosts_710159f7-5bb4-42cf-b644-f01220abf2ef" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsOfDebtExtinguishmentCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_us-gaap_PaymentsOfDebtExtinguishmentCosts_710159f7-5bb4-42cf-b644-f01220abf2ef" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_f9cfabe6-4962-4756-b0fe-a241129491df" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_f9cfabe6-4962-4756-b0fe-a241129491df" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentIncreaseDecreaseForPeriodNet_3cbd05a1-f296-48ef-93fb-acf0d6442373" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentIncreaseDecreaseForPeriodNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_us-gaap_DebtInstrumentIncreaseDecreaseForPeriodNet_3cbd05a1-f296-48ef-93fb-acf0d6442373" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRepurchaseAmount_2cc28a56-4930-49f0-940c-13997fdd19d2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentRepurchaseAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_us-gaap_DebtInstrumentRepurchaseAmount_2cc28a56-4930-49f0-940c-13997fdd19d2" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_a2e049fd-b1fa-4dba-b7fd-1f8b909f00d6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c483e1c2-aedb-4fab-98af-ae8a9abd2bbd" xlink:to="loc_us-gaap_DebtInstrumentTable_a2e049fd-b1fa-4dba-b7fd-1f8b909f00d6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_aabec797-476f-4b46-88ed-b39436a4f80c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_a2e049fd-b1fa-4dba-b7fd-1f8b909f00d6" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_aabec797-476f-4b46-88ed-b39436a4f80c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_aabec797-476f-4b46-88ed-b39436a4f80c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_aabec797-476f-4b46-88ed-b39436a4f80c" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_aabec797-476f-4b46-88ed-b39436a4f80c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_0cf8fbbe-430b-4085-ba97-6b6e95041dbe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_aabec797-476f-4b46-88ed-b39436a4f80c" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_0cf8fbbe-430b-4085-ba97-6b6e95041dbe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_3a3314e8-a2fa-48bb-b3dc-654a0ba9e6dd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0cf8fbbe-430b-4085-ba97-6b6e95041dbe" xlink:to="loc_us-gaap_ConvertibleDebtMember_3a3314e8-a2fa-48bb-b3dc-654a0ba9e6dd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_472556c4-dc25-45cf-aaa0-80c0d0babd5d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_a2e049fd-b1fa-4dba-b7fd-1f8b909f00d6" xlink:to="loc_us-gaap_DebtInstrumentAxis_472556c4-dc25-45cf-aaa0-80c0d0babd5d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_472556c4-dc25-45cf-aaa0-80c0d0babd5d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_472556c4-dc25-45cf-aaa0-80c0d0babd5d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_472556c4-dc25-45cf-aaa0-80c0d0babd5d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_7d408321-55e9-428c-83be-8f48b580913d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_472556c4-dc25-45cf-aaa0-80c0d0babd5d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_7d408321-55e9-428c-83be-8f48b580913d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesDue2024Member_7754c89a-8cc8-4af1-b08c-b87b051050eb" xlink:href="lpsn-20230331.xsd#lpsn_ConvertibleSeniorNotesDue2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_7d408321-55e9-428c-83be-8f48b580913d" xlink:to="loc_lpsn_ConvertibleSeniorNotesDue2024Member_7754c89a-8cc8-4af1-b08c-b87b051050eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesDue2026Member_f79e1e1d-cb57-433d-b1a7-00c08a4ecf77" xlink:href="lpsn-20230331.xsd#lpsn_ConvertibleSeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_7d408321-55e9-428c-83be-8f48b580913d" xlink:to="loc_lpsn_ConvertibleSeniorNotesDue2026Member_f79e1e1d-cb57-433d-b1a7-00c08a4ecf77" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_CappedCallsMember_30aca5d4-74fc-4012-ab24-013daafc0a7c" xlink:href="lpsn-20230331.xsd#lpsn_CappedCallsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_7d408321-55e9-428c-83be-8f48b580913d" xlink:to="loc_lpsn_CappedCallsMember_30aca5d4-74fc-4012-ab24-013daafc0a7c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesMember_c5e4e27c-1ce1-4900-b922-d0b63669c23e" xlink:href="lpsn-20230331.xsd#lpsn_ConvertibleSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_7d408321-55e9-428c-83be-8f48b580913d" xlink:to="loc_lpsn_ConvertibleSeniorNotesMember_c5e4e27c-1ce1-4900-b922-d0b63669c23e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_cfbd419c-7610-4f0d-aa75-c4adc4222107" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_a2e049fd-b1fa-4dba-b7fd-1f8b909f00d6" xlink:to="loc_srt_RangeAxis_cfbd419c-7610-4f0d-aa75-c4adc4222107" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_cfbd419c-7610-4f0d-aa75-c4adc4222107_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_cfbd419c-7610-4f0d-aa75-c4adc4222107" xlink:to="loc_srt_RangeMember_cfbd419c-7610-4f0d-aa75-c4adc4222107_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_5c781d9f-73d3-4b98-a479-cfc2bfb2ac8b" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_cfbd419c-7610-4f0d-aa75-c4adc4222107" xlink:to="loc_srt_RangeMember_5c781d9f-73d3-4b98-a479-cfc2bfb2ac8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_4b5761fd-5ae0-4bdd-af08-2a83ce081b91" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_5c781d9f-73d3-4b98-a479-cfc2bfb2ac8b" xlink:to="loc_srt_MaximumMember_4b5761fd-5ae0-4bdd-af08-2a83ce081b91" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/ConvertibleSeniorNotesandCappedCallTransactionsScheduleofCarryingAmountofLiabilityComponentofConvertibleDebtDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#ConvertibleSeniorNotesandCappedCallTransactionsScheduleofCarryingAmountofLiabilityComponentofConvertibleDebtDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/ConvertibleSeniorNotesandCappedCallTransactionsScheduleofCarryingAmountofLiabilityComponentofConvertibleDebtDetails" xlink:type="extended" id="ib8171a2f605d4b4f86c17975cd892f95_ConvertibleSeniorNotesandCappedCallTransactionsScheduleofCarryingAmountofLiabilityComponentofConvertibleDebtDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_0e800ece-e81f-491a-9bab-f8f3b5eafa8d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAbstract_bdaf6a14-82e6-4b32-8c85-457cc556d1ad" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0e800ece-e81f-491a-9bab-f8f3b5eafa8d" xlink:to="loc_us-gaap_LongTermDebtAbstract_bdaf6a14-82e6-4b32-8c85-457cc556d1ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_1afe068b-78df-46dd-8480-2ee02b37fd12" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtAbstract_bdaf6a14-82e6-4b32-8c85-457cc556d1ad" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_1afe068b-78df-46dd-8480-2ee02b37fd12" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_ee39a6f5-405f-46d8-bb63-d573ff1b1d82" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtAbstract_bdaf6a14-82e6-4b32-8c85-457cc556d1ad" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_ee39a6f5-405f-46d8-bb63-d573ff1b1d82" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleNotesPayable_832485a9-9238-444d-ba0a-89f32424e6ad" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertibleNotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtAbstract_bdaf6a14-82e6-4b32-8c85-457cc556d1ad" xlink:to="loc_us-gaap_ConvertibleNotesPayable_832485a9-9238-444d-ba0a-89f32424e6ad" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_74752be3-6c58-4736-b669-7b9cb0c02a71" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0e800ece-e81f-491a-9bab-f8f3b5eafa8d" xlink:to="loc_us-gaap_DebtInstrumentTable_74752be3-6c58-4736-b669-7b9cb0c02a71" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_cea2ceab-08bf-4474-a554-d3c8bb455bb3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_74752be3-6c58-4736-b669-7b9cb0c02a71" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_cea2ceab-08bf-4474-a554-d3c8bb455bb3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_cea2ceab-08bf-4474-a554-d3c8bb455bb3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_cea2ceab-08bf-4474-a554-d3c8bb455bb3" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_cea2ceab-08bf-4474-a554-d3c8bb455bb3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_234731b7-22e0-4027-9f17-53ce00813c11" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_cea2ceab-08bf-4474-a554-d3c8bb455bb3" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_234731b7-22e0-4027-9f17-53ce00813c11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_1ce8a9c3-1e85-45d5-9302-1824800037aa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_234731b7-22e0-4027-9f17-53ce00813c11" xlink:to="loc_us-gaap_ConvertibleDebtMember_1ce8a9c3-1e85-45d5-9302-1824800037aa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_b42c4ffb-f741-401b-881a-a5aeefb0512c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_74752be3-6c58-4736-b669-7b9cb0c02a71" xlink:to="loc_us-gaap_DebtInstrumentAxis_b42c4ffb-f741-401b-881a-a5aeefb0512c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_b42c4ffb-f741-401b-881a-a5aeefb0512c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_b42c4ffb-f741-401b-881a-a5aeefb0512c" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_b42c4ffb-f741-401b-881a-a5aeefb0512c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_30ad68ef-9e55-483d-8f83-a243f5e449bf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_b42c4ffb-f741-401b-881a-a5aeefb0512c" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_30ad68ef-9e55-483d-8f83-a243f5e449bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesMember_fa1ba19f-ddf6-484c-93e0-2ef3040b0eb7" xlink:href="lpsn-20230331.xsd#lpsn_ConvertibleSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_30ad68ef-9e55-483d-8f83-a243f5e449bf" xlink:to="loc_lpsn_ConvertibleSeniorNotesMember_fa1ba19f-ddf6-484c-93e0-2ef3040b0eb7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/ConvertibleSeniorNotesandCappedCallTransactionsScheduleofInterestExpenseIncurredDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#ConvertibleSeniorNotesandCappedCallTransactionsScheduleofInterestExpenseIncurredDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/ConvertibleSeniorNotesandCappedCallTransactionsScheduleofInterestExpenseIncurredDetails" xlink:type="extended" id="i935b240e33d8479b9661f2002296a351_ConvertibleSeniorNotesandCappedCallTransactionsScheduleofInterestExpenseIncurredDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_e2a4defd-6449-4a4e-8e99-3e8f97913b81" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebtExcludingAmortization_7ce7fe5e-5051-4605-bb5a-8c62e65338d9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestExpenseDebtExcludingAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e2a4defd-6449-4a4e-8e99-3e8f97913b81" xlink:to="loc_us-gaap_InterestExpenseDebtExcludingAmortization_7ce7fe5e-5051-4605-bb5a-8c62e65338d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_7f1e55fe-18bc-4c4d-be3f-715e9268de24" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AmortizationOfFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e2a4defd-6449-4a4e-8e99-3e8f97913b81" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_7f1e55fe-18bc-4c4d-be3f-715e9268de24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_f084c84a-5544-4b77-ad81-bad5efcf0dff" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestExpenseDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e2a4defd-6449-4a4e-8e99-3e8f97913b81" xlink:to="loc_us-gaap_InterestExpenseDebt_f084c84a-5544-4b77-ad81-bad5efcf0dff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_10f224e9-7b11-4b11-a71f-c70333b89490" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e2a4defd-6449-4a4e-8e99-3e8f97913b81" xlink:to="loc_us-gaap_DebtInstrumentTable_10f224e9-7b11-4b11-a71f-c70333b89490" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_a785162d-fc43-413b-9114-bef530b4e4dc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_10f224e9-7b11-4b11-a71f-c70333b89490" xlink:to="loc_us-gaap_DebtInstrumentAxis_a785162d-fc43-413b-9114-bef530b4e4dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_a785162d-fc43-413b-9114-bef530b4e4dc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_a785162d-fc43-413b-9114-bef530b4e4dc" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_a785162d-fc43-413b-9114-bef530b4e4dc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_c9926b77-b159-4332-9328-68787b800f28" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_a785162d-fc43-413b-9114-bef530b4e4dc" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_c9926b77-b159-4332-9328-68787b800f28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ConvertibleSeniorNotesMember_d1d255cf-4512-4570-a8f8-c9d2e3535d3d" xlink:href="lpsn-20230331.xsd#lpsn_ConvertibleSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_c9926b77-b159-4332-9328-68787b800f28" xlink:to="loc_lpsn_ConvertibleSeniorNotesMember_d1d255cf-4512-4570-a8f8-c9d2e3535d3d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_d4af29b2-103e-4966-9646-ff64d7ba0438" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_10f224e9-7b11-4b11-a71f-c70333b89490" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_d4af29b2-103e-4966-9646-ff64d7ba0438" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_d4af29b2-103e-4966-9646-ff64d7ba0438_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_d4af29b2-103e-4966-9646-ff64d7ba0438" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_d4af29b2-103e-4966-9646-ff64d7ba0438_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_ccb4e73d-4fff-4d0d-82b8-ad9458a9259b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_d4af29b2-103e-4966-9646-ff64d7ba0438" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_ccb4e73d-4fff-4d0d-82b8-ad9458a9259b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_d5f8df0d-41f1-40d0-be84-fbe0ed104f54" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_ccb4e73d-4fff-4d0d-82b8-ad9458a9259b" xlink:to="loc_us-gaap_ConvertibleDebtMember_d5f8df0d-41f1-40d0-be84-fbe0ed104f54" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/AcquisitionsNarrativeDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#AcquisitionsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/AcquisitionsNarrativeDetails" xlink:type="extended" id="i643bc482cd214d67a7f4ae65530d4cd6_AcquisitionsNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_26aa64ac-1985-4510-bae9-2fedca8594aa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_9f512c0b-3819-4b8e-a50b-bc363f660afe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_26aa64ac-1985-4510-bae9-2fedca8594aa" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_9f512c0b-3819-4b8e-a50b-bc363f660afe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_ab314f50-2421-40d1-8808-9590858c343a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_26aa64ac-1985-4510-bae9-2fedca8594aa" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_ab314f50-2421-40d1-8808-9590858c343a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_154a7f6c-e262-4420-af7e-1f993ac8051e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_26aa64ac-1985-4510-bae9-2fedca8594aa" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_154a7f6c-e262-4420-af7e-1f993ac8051e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_e46a26dc-ef34-41db-ae1f-79f2eeea906e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_26aa64ac-1985-4510-bae9-2fedca8594aa" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_e46a26dc-ef34-41db-ae1f-79f2eeea906e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_18c370be-b63e-49f2-91ba-a17fa551a0e5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_26aa64ac-1985-4510-bae9-2fedca8594aa" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_18c370be-b63e-49f2-91ba-a17fa551a0e5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionSharePrice_6861d96f-f41d-42fd-a2bb-7f4d9767ab62" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionSharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_26aa64ac-1985-4510-bae9-2fedca8594aa" xlink:to="loc_us-gaap_BusinessAcquisitionSharePrice_6861d96f-f41d-42fd-a2bb-7f4d9767ab62" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_46443f67-a066-49aa-922e-73f723297565" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_26aa64ac-1985-4510-bae9-2fedca8594aa" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_46443f67-a066-49aa-922e-73f723297565" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_CashElectionRestrictionPercentage_d00aca8f-c772-45ed-82ef-61c5eaad3199" xlink:href="lpsn-20230331.xsd#lpsn_CashElectionRestrictionPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_26aa64ac-1985-4510-bae9-2fedca8594aa" xlink:to="loc_lpsn_CashElectionRestrictionPercentage_d00aca8f-c772-45ed-82ef-61c5eaad3199" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_BusinessCombinationEarnOutPaymentsAccrued_89101075-21fa-4eee-82eb-d0d33d7aadd5" xlink:href="lpsn-20230331.xsd#lpsn_BusinessCombinationEarnOutPaymentsAccrued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_26aa64ac-1985-4510-bae9-2fedca8594aa" xlink:to="loc_lpsn_BusinessCombinationEarnOutPaymentsAccrued_89101075-21fa-4eee-82eb-d0d33d7aadd5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_923bf92b-4805-454a-9d8c-64e6f73be162" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_26aa64ac-1985-4510-bae9-2fedca8594aa" xlink:to="loc_us-gaap_Goodwill_923bf92b-4805-454a-9d8c-64e6f73be162" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_0120e1eb-8846-44e5-8b2a-77e7a0130ead" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_26aa64ac-1985-4510-bae9-2fedca8594aa" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_0120e1eb-8846-44e5-8b2a-77e7a0130ead" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_8a62a46c-f4bf-4955-9128-d281d59fb285" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_26aa64ac-1985-4510-bae9-2fedca8594aa" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_8a62a46c-f4bf-4955-9128-d281d59fb285" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationIndemnificationAssetsRangeOfOutcomesValueHigh_f3a5c774-6ea9-4910-a20b-61371acb7689" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationIndemnificationAssetsRangeOfOutcomesValueHigh"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_26aa64ac-1985-4510-bae9-2fedca8594aa" xlink:to="loc_us-gaap_BusinessCombinationIndemnificationAssetsRangeOfOutcomesValueHigh_f3a5c774-6ea9-4910-a20b-61371acb7689" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01d1fc9a-ed9e-4211-b2e6-cc57cb168d4a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_26aa64ac-1985-4510-bae9-2fedca8594aa" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01d1fc9a-ed9e-4211-b2e6-cc57cb168d4a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_e1fceb7e-83ef-4a4b-b5dd-0b8c412a802c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01d1fc9a-ed9e-4211-b2e6-cc57cb168d4a" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_e1fceb7e-83ef-4a4b-b5dd-0b8c412a802c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e1fceb7e-83ef-4a4b-b5dd-0b8c412a802c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_e1fceb7e-83ef-4a4b-b5dd-0b8c412a802c" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e1fceb7e-83ef-4a4b-b5dd-0b8c412a802c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_639a63e9-235d-4bcb-81f6-a4fc9e0b1cfc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_e1fceb7e-83ef-4a4b-b5dd-0b8c412a802c" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_639a63e9-235d-4bcb-81f6-a4fc9e0b1cfc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_WildHealthMember_de253efc-a84a-47fe-8df8-a81c49282c7c" xlink:href="lpsn-20230331.xsd#lpsn_WildHealthMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_639a63e9-235d-4bcb-81f6-a4fc9e0b1cfc" xlink:to="loc_lpsn_WildHealthMember_de253efc-a84a-47fe-8df8-a81c49282c7c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/LeasesNarrativeDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#LeasesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/LeasesNarrativeDetails" xlink:type="extended" id="iaac59a45bd4b44078387719d0b0b5d3c_LeasesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_977ebf6f-b3ff-495c-af59-60ae734f5882" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseRemainingLeaseTerm_c96ac2ee-410b-48d7-b41b-f8625e3aeac1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseRemainingLeaseTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_977ebf6f-b3ff-495c-af59-60ae734f5882" xlink:to="loc_us-gaap_LesseeOperatingLeaseRemainingLeaseTerm_c96ac2ee-410b-48d7-b41b-f8625e3aeac1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_d8214e44-52af-4732-b8e5-9ac59ab2dcc3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_977ebf6f-b3ff-495c-af59-60ae734f5882" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_d8214e44-52af-4732-b8e5-9ac59ab2dcc3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_40c76706-19ac-459a-a64d-8a4aba3fa45a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_977ebf6f-b3ff-495c-af59-60ae734f5882" xlink:to="loc_us-gaap_OperatingLeaseLiability_40c76706-19ac-459a-a64d-8a4aba3fa45a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCash_784602bb-520d-477e-a86f-f4421bcbf4c6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_977ebf6f-b3ff-495c-af59-60ae734f5882" xlink:to="loc_us-gaap_RestrictedCash_784602bb-520d-477e-a86f-f4421bcbf4c6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_a439247f-1f8f-40d4-8cc2-7bbdc4215919" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_977ebf6f-b3ff-495c-af59-60ae734f5882" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_a439247f-1f8f-40d4-8cc2-7bbdc4215919" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_1d270532-685e-4af7-89a4-e09cc2c9f33f" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_a439247f-1f8f-40d4-8cc2-7bbdc4215919" xlink:to="loc_srt_RangeAxis_1d270532-685e-4af7-89a4-e09cc2c9f33f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_1d270532-685e-4af7-89a4-e09cc2c9f33f_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_1d270532-685e-4af7-89a4-e09cc2c9f33f" xlink:to="loc_srt_RangeMember_1d270532-685e-4af7-89a4-e09cc2c9f33f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_af93444f-4e3c-4b9a-a215-f3a7c553e9dd" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_1d270532-685e-4af7-89a4-e09cc2c9f33f" xlink:to="loc_srt_RangeMember_af93444f-4e3c-4b9a-a215-f3a7c553e9dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_d615a0ba-c989-4a48-8129-b5efe49a7847" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_af93444f-4e3c-4b9a-a215-f3a7c553e9dd" xlink:to="loc_srt_MinimumMember_d615a0ba-c989-4a48-8129-b5efe49a7847" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_e17d785b-106d-499b-80ab-393047f29be2" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_af93444f-4e3c-4b9a-a215-f3a7c553e9dd" xlink:to="loc_srt_MaximumMember_e17d785b-106d-499b-80ab-393047f29be2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_7119bcea-e7b4-4ebb-9b27-1ab9fb0b16a4" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_a439247f-1f8f-40d4-8cc2-7bbdc4215919" xlink:to="loc_srt_StatementGeographicalAxis_7119bcea-e7b4-4ebb-9b27-1ab9fb0b16a4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_7119bcea-e7b4-4ebb-9b27-1ab9fb0b16a4_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_7119bcea-e7b4-4ebb-9b27-1ab9fb0b16a4" xlink:to="loc_srt_SegmentGeographicalDomain_7119bcea-e7b4-4ebb-9b27-1ab9fb0b16a4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_c1a35252-a23d-416b-b9d0-a557a766c136" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_7119bcea-e7b4-4ebb-9b27-1ab9fb0b16a4" xlink:to="loc_srt_SegmentGeographicalDomain_c1a35252-a23d-416b-b9d0-a557a766c136" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_IL_b1e45e83-0087-49d1-9e43-d2892e0215d3" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_IL"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_c1a35252-a23d-416b-b9d0-a557a766c136" xlink:to="loc_country_IL_b1e45e83-0087-49d1-9e43-d2892e0215d3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_AU_0a6e85ad-00d7-42f5-b77f-a48d7184821a" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_AU"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_c1a35252-a23d-416b-b9d0-a557a766c136" xlink:to="loc_country_AU_0a6e85ad-00d7-42f5-b77f-a48d7184821a" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/FairValueMeasurementsFinancialAssetsandLiabilitiesDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#FairValueMeasurementsFinancialAssetsandLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/FairValueMeasurementsFinancialAssetsandLiabilitiesDetails" xlink:type="extended" id="i9e689572bb9e4d2881dd7b122b672127_FairValueMeasurementsFinancialAssetsandLiabilitiesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_08e56673-5100-4fac-9be0-01810ac3935a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_cc4cf1dc-2cae-4c8c-ba70-99c77c962890" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_08e56673-5100-4fac-9be0-01810ac3935a" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_cc4cf1dc-2cae-4c8c-ba70-99c77c962890" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_78d53a15-582d-4c36-aa83-393b8111774d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_cc4cf1dc-2cae-4c8c-ba70-99c77c962890" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_78d53a15-582d-4c36-aa83-393b8111774d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_a975f203-9606-4522-a427-2fb217a2fa1c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_cc4cf1dc-2cae-4c8c-ba70-99c77c962890" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_a975f203-9606-4522-a427-2fb217a2fa1c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_EarnOutsTreatedAsContingentCompensation_1fc219ab-31d3-4dca-8821-963427a33475" xlink:href="lpsn-20230331.xsd#lpsn_EarnOutsTreatedAsContingentCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_cc4cf1dc-2cae-4c8c-ba70-99c77c962890" xlink:to="loc_lpsn_EarnOutsTreatedAsContingentCompensation_1fc219ab-31d3-4dca-8821-963427a33475" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_EarnOutsTreatedAsLiabilityAwards_9faa32f3-aa01-40ee-9fde-99420e051046" xlink:href="lpsn-20230331.xsd#lpsn_EarnOutsTreatedAsLiabilityAwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_cc4cf1dc-2cae-4c8c-ba70-99c77c962890" xlink:to="loc_lpsn_EarnOutsTreatedAsLiabilityAwards_9faa32f3-aa01-40ee-9fde-99420e051046" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_31fb7c68-3b16-4205-8d2c-a94ddd27d343" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_08e56673-5100-4fac-9be0-01810ac3935a" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_31fb7c68-3b16-4205-8d2c-a94ddd27d343" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_f2002e64-9b08-43df-9f0d-40020726e518" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_31fb7c68-3b16-4205-8d2c-a94ddd27d343" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_f2002e64-9b08-43df-9f0d-40020726e518" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_7fd8f445-5494-4544-bea1-d1aed365cd3e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_31fb7c68-3b16-4205-8d2c-a94ddd27d343" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_7fd8f445-5494-4544-bea1-d1aed365cd3e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_e7e4e566-1f18-42f3-a572-eb4b6e67ea07" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_08e56673-5100-4fac-9be0-01810ac3935a" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_e7e4e566-1f18-42f3-a572-eb4b6e67ea07" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_af8194fc-6085-4099-b526-5cdfe7b0a94c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_e7e4e566-1f18-42f3-a572-eb4b6e67ea07" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_af8194fc-6085-4099-b526-5cdfe7b0a94c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_af8194fc-6085-4099-b526-5cdfe7b0a94c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_af8194fc-6085-4099-b526-5cdfe7b0a94c" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_af8194fc-6085-4099-b526-5cdfe7b0a94c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_9de25761-0df0-4198-85b6-e8a88eb495d2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_af8194fc-6085-4099-b526-5cdfe7b0a94c" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_9de25761-0df0-4198-85b6-e8a88eb495d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_96bab187-732f-481d-9ade-cee774e2b9f5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_9de25761-0df0-4198-85b6-e8a88eb495d2" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_96bab187-732f-481d-9ade-cee774e2b9f5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1a8dd3e3-37f8-4fae-ab7c-dc2f75ba4f45" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_e7e4e566-1f18-42f3-a572-eb4b6e67ea07" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1a8dd3e3-37f8-4fae-ab7c-dc2f75ba4f45" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1a8dd3e3-37f8-4fae-ab7c-dc2f75ba4f45_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1a8dd3e3-37f8-4fae-ab7c-dc2f75ba4f45" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1a8dd3e3-37f8-4fae-ab7c-dc2f75ba4f45_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_fe88f4bc-c725-4232-b050-ddc1d36f5b70" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1a8dd3e3-37f8-4fae-ab7c-dc2f75ba4f45" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_fe88f4bc-c725-4232-b050-ddc1d36f5b70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_a334d5a0-9d35-4b09-a0cf-a2e82bba68b6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_fe88f4bc-c725-4232-b050-ddc1d36f5b70" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_a334d5a0-9d35-4b09-a0cf-a2e82bba68b6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_07b9183c-f87b-4189-b61a-bbd2c222bec6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_fe88f4bc-c725-4232-b050-ddc1d36f5b70" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_07b9183c-f87b-4189-b61a-bbd2c222bec6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_678ea604-16a6-4e40-9a9d-2557fc71cc4c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_fe88f4bc-c725-4232-b050-ddc1d36f5b70" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_678ea604-16a6-4e40-9a9d-2557fc71cc4c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_4bf45e7a-5be8-4498-919d-a531eda79bb6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_e7e4e566-1f18-42f3-a572-eb4b6e67ea07" xlink:to="loc_us-gaap_FinancialInstrumentAxis_4bf45e7a-5be8-4498-919d-a531eda79bb6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_4bf45e7a-5be8-4498-919d-a531eda79bb6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_4bf45e7a-5be8-4498-919d-a531eda79bb6" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_4bf45e7a-5be8-4498-919d-a531eda79bb6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_68f5c806-afea-4299-974c-febea3efa001" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_4bf45e7a-5be8-4498-919d-a531eda79bb6" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_68f5c806-afea-4299-974c-febea3efa001" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ContingentEarnOutMember_f5fc2b63-3e99-4f5a-9ffe-f3a9a5fab801" xlink:href="lpsn-20230331.xsd#lpsn_ContingentEarnOutMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_68f5c806-afea-4299-974c-febea3efa001" xlink:to="loc_lpsn_ContingentEarnOutMember_f5fc2b63-3e99-4f5a-9ffe-f3a9a5fab801" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/FairValueMeasurementsChangesinFairValueofLevel3LiabilitiesDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#FairValueMeasurementsChangesinFairValueofLevel3LiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/FairValueMeasurementsChangesinFairValueofLevel3LiabilitiesDetails" xlink:type="extended" id="i74924dc5037343e6aa220e2ec9901890_FairValueMeasurementsChangesinFairValueofLevel3LiabilitiesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_31ec3453-5515-4d58-85d6-375029b22d4c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_0143c3ea-4173-497e-971d-860d10d2a502" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_31ec3453-5515-4d58-85d6-375029b22d4c" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_0143c3ea-4173-497e-971d-860d10d2a502" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_9f1484a6-a9fc-42c8-8438-5a6d5a0be99f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_0143c3ea-4173-497e-971d-860d10d2a502" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_9f1484a6-a9fc-42c8-8438-5a6d5a0be99f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_cb206627-9f21-424a-8287-6fe085a94ea5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_0143c3ea-4173-497e-971d-860d10d2a502" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_cb206627-9f21-424a-8287-6fe085a94ea5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease_07b2e245-3148-4f60-a97b-62a1bf665753" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_0143c3ea-4173-497e-971d-860d10d2a502" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease_07b2e245-3148-4f60-a97b-62a1bf665753" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_6fa31963-f487-4d85-8fbc-71526d81b7ac" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f76430e0-a63d-4bc8-a2df-e4f353eb4aa0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_31ec3453-5515-4d58-85d6-375029b22d4c" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f76430e0-a63d-4bc8-a2df-e4f353eb4aa0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_6aefd096-4984-4719-a19f-ee4d86c3573e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f76430e0-a63d-4bc8-a2df-e4f353eb4aa0" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_6aefd096-4984-4719-a19f-ee4d86c3573e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_6aefd096-4984-4719-a19f-ee4d86c3573e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_6aefd096-4984-4719-a19f-ee4d86c3573e" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_6aefd096-4984-4719-a19f-ee4d86c3573e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_9def6ebc-0a8a-413c-b4c5-81043b7013bb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_6aefd096-4984-4719-a19f-ee4d86c3573e" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_9def6ebc-0a8a-413c-b4c5-81043b7013bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ContingentEarnOutMember_ce1fbcb5-7bab-4b62-9151-3072d4dfe523" xlink:href="lpsn-20230331.xsd#lpsn_ContingentEarnOutMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_9def6ebc-0a8a-413c-b4c5-81043b7013bb" xlink:to="loc_lpsn_ContingentEarnOutMember_ce1fbcb5-7bab-4b62-9151-3072d4dfe523" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ContingentConsiderationMember_30fd3336-019c-4a84-b44e-3d924f6d0f5e" xlink:href="lpsn-20230331.xsd#lpsn_ContingentConsiderationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_9def6ebc-0a8a-413c-b4c5-81043b7013bb" xlink:to="loc_lpsn_ContingentConsiderationMember_30fd3336-019c-4a84-b44e-3d924f6d0f5e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ContingentCompensationMember_2912599c-e2f5-48c2-a05d-afa9e941c166" xlink:href="lpsn-20230331.xsd#lpsn_ContingentCompensationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_9def6ebc-0a8a-413c-b4c5-81043b7013bb" xlink:to="loc_lpsn_ContingentCompensationMember_2912599c-e2f5-48c2-a05d-afa9e941c166" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_010a06a0-df56-4378-a15b-4c089eb2818f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f76430e0-a63d-4bc8-a2df-e4f353eb4aa0" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_010a06a0-df56-4378-a15b-4c089eb2818f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_010a06a0-df56-4378-a15b-4c089eb2818f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_010a06a0-df56-4378-a15b-4c089eb2818f" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_010a06a0-df56-4378-a15b-4c089eb2818f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f17009d1-c16d-43fd-9cc6-4db9b3b0733d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_010a06a0-df56-4378-a15b-4c089eb2818f" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f17009d1-c16d-43fd-9cc6-4db9b3b0733d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_WildHealthMember_64fdd56d-795f-4539-9ddf-5bdff382c04d" xlink:href="lpsn-20230331.xsd#lpsn_WildHealthMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f17009d1-c16d-43fd-9cc6-4db9b3b0733d" xlink:to="loc_lpsn_WildHealthMember_64fdd56d-795f-4539-9ddf-5bdff382c04d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_TenfoldMember_344abbad-b86f-49b8-a054-bb99c0c67ff1" xlink:href="lpsn-20230331.xsd#lpsn_TenfoldMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f17009d1-c16d-43fd-9cc6-4db9b3b0733d" xlink:to="loc_lpsn_TenfoldMember_344abbad-b86f-49b8-a054-bb99c0c67ff1" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/FairValueMeasurementsNarrativeDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#FairValueMeasurementsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/FairValueMeasurementsNarrativeDetails" xlink:type="extended" id="i77604bfbf2224a40ad6ca6fb08c9196a_FairValueMeasurementsNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_07b595cb-b974-45cc-9c1c-5507e44ca001" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtFairValueDisclosures_1861c621-a9a1-46b9-8d26-c6308994b7dc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertibleDebtFairValueDisclosures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_07b595cb-b974-45cc-9c1c-5507e44ca001" xlink:to="loc_us-gaap_ConvertibleDebtFairValueDisclosures_1861c621-a9a1-46b9-8d26-c6308994b7dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeBenefitsAndShareBasedCompensation_5ef538e0-e4b0-417a-be6b-9e3663af6c92" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeBenefitsAndShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_07b595cb-b974-45cc-9c1c-5507e44ca001" xlink:to="loc_us-gaap_EmployeeBenefitsAndShareBasedCompensation_5ef538e0-e4b0-417a-be6b-9e3663af6c92" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c4d36d00-86c1-4724-9475-baac0c8739dd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_07b595cb-b974-45cc-9c1c-5507e44ca001" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c4d36d00-86c1-4724-9475-baac0c8739dd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_7f8a9945-396c-4992-ad39-10055f36cf03" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c4d36d00-86c1-4724-9475-baac0c8739dd" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_7f8a9945-396c-4992-ad39-10055f36cf03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_7f8a9945-396c-4992-ad39-10055f36cf03_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_7f8a9945-396c-4992-ad39-10055f36cf03" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_7f8a9945-396c-4992-ad39-10055f36cf03_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_c863a9e3-8244-40c4-9b1a-643e22c64637" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_7f8a9945-396c-4992-ad39-10055f36cf03" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_c863a9e3-8244-40c4-9b1a-643e22c64637" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ContingentEarnOutMember_9bf953d3-98ad-4230-8a3b-6195495c61e2" xlink:href="lpsn-20230331.xsd#lpsn_ContingentEarnOutMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_c863a9e3-8244-40c4-9b1a-643e22c64637" xlink:to="loc_lpsn_ContingentEarnOutMember_9bf953d3-98ad-4230-8a3b-6195495c61e2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_293e74cf-f1ee-4b72-bb4c-4b13f90cbf97" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c4d36d00-86c1-4724-9475-baac0c8739dd" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_293e74cf-f1ee-4b72-bb4c-4b13f90cbf97" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_293e74cf-f1ee-4b72-bb4c-4b13f90cbf97_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_293e74cf-f1ee-4b72-bb4c-4b13f90cbf97" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_293e74cf-f1ee-4b72-bb4c-4b13f90cbf97_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_e5d23d01-b443-4a7c-b4fb-efefde830c0e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_293e74cf-f1ee-4b72-bb4c-4b13f90cbf97" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_e5d23d01-b443-4a7c-b4fb-efefde830c0e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_e4a0e6c1-45e2-4f5c-b1f7-3a3e07904995" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_e5d23d01-b443-4a7c-b4fb-efefde830c0e" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_e4a0e6c1-45e2-4f5c-b1f7-3a3e07904995" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_35f1fc36-dc0a-44b6-a413-da96d5668bed" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c4d36d00-86c1-4724-9475-baac0c8739dd" xlink:to="loc_us-gaap_FinancialInstrumentAxis_35f1fc36-dc0a-44b6-a413-da96d5668bed" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_35f1fc36-dc0a-44b6-a413-da96d5668bed_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_35f1fc36-dc0a-44b6-a413-da96d5668bed" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_35f1fc36-dc0a-44b6-a413-da96d5668bed_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_684564eb-806f-4090-8698-5f8a6c94a89b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_35f1fc36-dc0a-44b6-a413-da96d5668bed" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_684564eb-806f-4090-8698-5f8a6c94a89b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorDebtObligationsMember_a8214e6c-93bd-4bbd-a063-984e13e7ce9b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SeniorDebtObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_684564eb-806f-4090-8698-5f8a6c94a89b" xlink:to="loc_us-gaap_SeniorDebtObligationsMember_a8214e6c-93bd-4bbd-a063-984e13e7ce9b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_4b13f293-a3ad-4065-a2f2-1acd16dd16a0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c4d36d00-86c1-4724-9475-baac0c8739dd" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_4b13f293-a3ad-4065-a2f2-1acd16dd16a0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_4b13f293-a3ad-4065-a2f2-1acd16dd16a0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_4b13f293-a3ad-4065-a2f2-1acd16dd16a0" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_4b13f293-a3ad-4065-a2f2-1acd16dd16a0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_a41ac422-420d-4814-9d43-441d0c2807b7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_4b13f293-a3ad-4065-a2f2-1acd16dd16a0" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_a41ac422-420d-4814-9d43-441d0c2807b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherExpenseMember_2c3a58be-41b7-40da-8bea-9a1bcb01acbc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_a41ac422-420d-4814-9d43-441d0c2807b7" xlink:to="loc_us-gaap_OtherExpenseMember_2c3a58be-41b7-40da-8bea-9a1bcb01acbc" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#CommitmentsandContingenciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="extended" id="i718bab8c1ded4552ac86ddcc19ed4545_CommitmentsandContingenciesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsLineItems_45c13775-e0b2-424a-9a2e-8691c4ff6635" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCommitmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch_60b8405e-5082-4387-8148-44b084b4ff5e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_45c13775-e0b2-424a-9a2e-8691c4ff6635" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch_60b8405e-5082-4387-8148-44b084b4ff5e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_865e5db7-85e5-42cb-ba2b-b916bb78eb43" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_45c13775-e0b2-424a-9a2e-8691c4ff6635" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_865e5db7-85e5-42cb-ba2b-b916bb78eb43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_49a1d612-8464-4c8c-84b9-afc1b206ae9f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_45c13775-e0b2-424a-9a2e-8691c4ff6635" xlink:to="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_49a1d612-8464-4c8c-84b9-afc1b206ae9f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_1449753f-4709-4645-a08c-752204269c63" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_45c13775-e0b2-424a-9a2e-8691c4ff6635" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_1449753f-4709-4645-a08c-752204269c63" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_EstimatedSalesTaxLiabilityIncludingInterestMinimum_44442e05-0321-4943-8454-c807bb32678b" xlink:href="lpsn-20230331.xsd#lpsn_EstimatedSalesTaxLiabilityIncludingInterestMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_45c13775-e0b2-424a-9a2e-8691c4ff6635" xlink:to="loc_lpsn_EstimatedSalesTaxLiabilityIncludingInterestMinimum_44442e05-0321-4943-8454-c807bb32678b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_EstimatedSalesTaxLiabilityIncludingInterestMaximum_1077ff0e-31d1-4223-ab6e-56f2e3cb2efe" xlink:href="lpsn-20230331.xsd#lpsn_EstimatedSalesTaxLiabilityIncludingInterestMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_45c13775-e0b2-424a-9a2e-8691c4ff6635" xlink:to="loc_lpsn_EstimatedSalesTaxLiabilityIncludingInterestMaximum_1077ff0e-31d1-4223-ab6e-56f2e3cb2efe" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_AccruedSalesTaxLiabilityIncludingInterest_d5e5ea4e-4803-4dfb-adca-29566e4bc0bd" xlink:href="lpsn-20230331.xsd#lpsn_AccruedSalesTaxLiabilityIncludingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_45c13775-e0b2-424a-9a2e-8691c4ff6635" xlink:to="loc_lpsn_AccruedSalesTaxLiabilityIncludingInterest_d5e5ea4e-4803-4dfb-adca-29566e4bc0bd" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsTable_b54fa164-8879-43ad-b785-c00e42543913" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCommitmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_45c13775-e0b2-424a-9a2e-8691c4ff6635" xlink:to="loc_us-gaap_OtherCommitmentsTable_b54fa164-8879-43ad-b785-c00e42543913" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DefinedContributionPlanMatchGroupsAxis_320f3109-141a-4e4a-843d-6ec44bb33441" xlink:href="lpsn-20230331.xsd#lpsn_DefinedContributionPlanMatchGroupsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_b54fa164-8879-43ad-b785-c00e42543913" xlink:to="loc_lpsn_DefinedContributionPlanMatchGroupsAxis_320f3109-141a-4e4a-843d-6ec44bb33441" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DefinedContributionPlanMatchGroupsDomain_320f3109-141a-4e4a-843d-6ec44bb33441_default" xlink:href="lpsn-20230331.xsd#lpsn_DefinedContributionPlanMatchGroupsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_lpsn_DefinedContributionPlanMatchGroupsAxis_320f3109-141a-4e4a-843d-6ec44bb33441" xlink:to="loc_lpsn_DefinedContributionPlanMatchGroupsDomain_320f3109-141a-4e4a-843d-6ec44bb33441_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DefinedContributionPlanMatchGroupsDomain_7c8b8387-a782-444d-a6af-a795f0922407" xlink:href="lpsn-20230331.xsd#lpsn_DefinedContributionPlanMatchGroupsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_lpsn_DefinedContributionPlanMatchGroupsAxis_320f3109-141a-4e4a-843d-6ec44bb33441" xlink:to="loc_lpsn_DefinedContributionPlanMatchGroupsDomain_7c8b8387-a782-444d-a6af-a795f0922407" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_MatchingTrancheOneMember_37cd02cf-63ba-4cab-b9e2-8936776ca026" xlink:href="lpsn-20230331.xsd#lpsn_MatchingTrancheOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_DefinedContributionPlanMatchGroupsDomain_7c8b8387-a782-444d-a6af-a795f0922407" xlink:to="loc_lpsn_MatchingTrancheOneMember_37cd02cf-63ba-4cab-b9e2-8936776ca026" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_MatchingTrancheTwoMember_f0abad62-879d-4b7d-b27d-8f3383c3a877" xlink:href="lpsn-20230331.xsd#lpsn_MatchingTrancheTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_DefinedContributionPlanMatchGroupsDomain_7c8b8387-a782-444d-a6af-a795f0922407" xlink:to="loc_lpsn_MatchingTrancheTwoMember_f0abad62-879d-4b7d-b27d-8f3383c3a877" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_d2b839ca-5a4e-4b2d-934b-064e661eaa31" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_b54fa164-8879-43ad-b785-c00e42543913" xlink:to="loc_us-gaap_CreditFacilityAxis_d2b839ca-5a4e-4b2d-934b-064e661eaa31" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_d2b839ca-5a4e-4b2d-934b-064e661eaa31_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_d2b839ca-5a4e-4b2d-934b-064e661eaa31" xlink:to="loc_us-gaap_CreditFacilityDomain_d2b839ca-5a4e-4b2d-934b-064e661eaa31_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_fa62183b-cecc-4c7c-842b-69cb6e9cc813" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_d2b839ca-5a4e-4b2d-934b-064e661eaa31" xlink:to="loc_us-gaap_CreditFacilityDomain_fa62183b-cecc-4c7c-842b-69cb6e9cc813" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_fe2bcdec-0944-4864-ae90-176a1355714f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_fa62183b-cecc-4c7c-842b-69cb6e9cc813" xlink:to="loc_us-gaap_LetterOfCreditMember_fe2bcdec-0944-4864-ae90-176a1355714f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_7da07b0e-e9d8-45a2-8b6f-ae3795f76ec0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_b54fa164-8879-43ad-b785-c00e42543913" xlink:to="loc_us-gaap_DebtInstrumentAxis_7da07b0e-e9d8-45a2-8b6f-ae3795f76ec0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_7da07b0e-e9d8-45a2-8b6f-ae3795f76ec0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_7da07b0e-e9d8-45a2-8b6f-ae3795f76ec0" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_7da07b0e-e9d8-45a2-8b6f-ae3795f76ec0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_9857b1d0-147d-4d89-a33f-d42d5b0de671" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_7da07b0e-e9d8-45a2-8b6f-ae3795f76ec0" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_9857b1d0-147d-4d89-a33f-d42d5b0de671" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_LetterOfCreditForSecurityDepositMember_42bdad4d-1c6a-4c53-b5b6-9b3af74d8352" xlink:href="lpsn-20230331.xsd#lpsn_LetterOfCreditForSecurityDepositMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_9857b1d0-147d-4d89-a33f-d42d5b0de671" xlink:to="loc_lpsn_LetterOfCreditForSecurityDepositMember_42bdad4d-1c6a-4c53-b5b6-9b3af74d8352" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/StockholdersEquitySummaryofRestrictedStockUnitActivityandWeightedAverageExercisePriceDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#StockholdersEquitySummaryofRestrictedStockUnitActivityandWeightedAverageExercisePriceDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/StockholdersEquitySummaryofRestrictedStockUnitActivityandWeightedAverageExercisePriceDetails" xlink:type="extended" id="i9cd5e86736784ba882fa4a85802ac9de_StockholdersEquitySummaryofRestrictedStockUnitActivityandWeightedAverageExercisePriceDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3814d541-3be3-456a-a15b-a410e5372124" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_f9801ae1-a4b7-4ef3-8e61-23cd596bddcb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3814d541-3be3-456a-a15b-a410e5372124" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_f9801ae1-a4b7-4ef3-8e61-23cd596bddcb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_d5ff17be-f865-4e6e-a710-d499dd538de4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_f9801ae1-a4b7-4ef3-8e61-23cd596bddcb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_d5ff17be-f865-4e6e-a710-d499dd538de4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted_a014b1c5-4483-4156-a7b7-ace064e9ee2a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_f9801ae1-a4b7-4ef3-8e61-23cd596bddcb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted_a014b1c5-4483-4156-a7b7-ace064e9ee2a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_b9ac4d55-31e2-4ed8-9e25-2285d1b05d70" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_f9801ae1-a4b7-4ef3-8e61-23cd596bddcb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_b9ac4d55-31e2-4ed8-9e25-2285d1b05d70" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures_4898eec1-4d7a-4a3c-80e4-4f7e7ee262a3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_f9801ae1-a4b7-4ef3-8e61-23cd596bddcb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures_4898eec1-4d7a-4a3c-80e4-4f7e7ee262a3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_6daa0dd2-760e-4038-ac2f-86f7d0d5d2f5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpectedToVest_92efcd92-8c8c-4e6b-bc48-f64b2e9312c1" xlink:href="lpsn-20230331.xsd#lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpectedToVest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_f9801ae1-a4b7-4ef3-8e61-23cd596bddcb" xlink:to="loc_lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpectedToVest_92efcd92-8c8c-4e6b-bc48-f64b2e9312c1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageGrantDateFairValueAbstractRollForward_b3977eff-710e-4029-8185-9699a3b7fe28" xlink:href="lpsn-20230331.xsd#lpsn_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageGrantDateFairValueAbstractRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3814d541-3be3-456a-a15b-a410e5372124" xlink:to="loc_lpsn_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageGrantDateFairValueAbstractRollForward_b3977eff-710e-4029-8185-9699a3b7fe28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_620b15ec-afd7-49be-891a-63fd70baf628" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageGrantDateFairValueAbstractRollForward_b3977eff-710e-4029-8185-9699a3b7fe28" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_620b15ec-afd7-49be-891a-63fd70baf628" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_5bb1ad36-877b-4628-bd69-55363e9af8a6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageGrantDateFairValueAbstractRollForward_b3977eff-710e-4029-8185-9699a3b7fe28" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_5bb1ad36-877b-4628-bd69-55363e9af8a6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_6a9b9855-2d3b-4ab2-a3df-58090cd08d0d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageGrantDateFairValueAbstractRollForward_b3977eff-710e-4029-8185-9699a3b7fe28" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_6a9b9855-2d3b-4ab2-a3df-58090cd08d0d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_c71e8e80-70f1-431e-a10a-4ff180f0edb4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageGrantDateFairValueAbstractRollForward_b3977eff-710e-4029-8185-9699a3b7fe28" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_c71e8e80-70f1-431e-a10a-4ff180f0edb4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_25885a52-def5-4f83-8699-99e63ec5c12a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpectedToVestWeightedAverageGrantDateFairValue_48f75d0e-9818-42f2-9a8a-afd0e1b0b400" xlink:href="lpsn-20230331.xsd#lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpectedToVestWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageGrantDateFairValueAbstractRollForward_b3977eff-710e-4029-8185-9699a3b7fe28" xlink:to="loc_lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpectedToVestWeightedAverageGrantDateFairValue_48f75d0e-9818-42f2-9a8a-afd0e1b0b400" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsAggregateIntrinsicValueRollForward_d1f496e2-33d0-4379-b0cb-3792847b8f36" xlink:href="lpsn-20230331.xsd#lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsAggregateIntrinsicValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3814d541-3be3-456a-a15b-a410e5372124" xlink:to="loc_lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsAggregateIntrinsicValueRollForward_d1f496e2-33d0-4379-b0cb-3792847b8f36" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsAggregateIntrinsicValueNonvestedAndOutstanding_0182dbd0-3da6-47c3-b314-de42ca31a9c0" xlink:href="lpsn-20230331.xsd#lpsn_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsAggregateIntrinsicValueNonvestedAndOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsAggregateIntrinsicValueRollForward_d1f496e2-33d0-4379-b0cb-3792847b8f36" xlink:to="loc_lpsn_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsAggregateIntrinsicValueNonvestedAndOutstanding_0182dbd0-3da6-47c3-b314-de42ca31a9c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsAggregateIntrinsicValueExpectedToVest_75c50dad-8b18-47da-97d3-bc164a86a881" xlink:href="lpsn-20230331.xsd#lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsAggregateIntrinsicValueExpectedToVest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsAggregateIntrinsicValueRollForward_d1f496e2-33d0-4379-b0cb-3792847b8f36" xlink:to="loc_lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsAggregateIntrinsicValueExpectedToVest_75c50dad-8b18-47da-97d3-bc164a86a881" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_16d1177e-2baf-4dde-8416-7592b3663bb5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3814d541-3be3-456a-a15b-a410e5372124" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_16d1177e-2baf-4dde-8416-7592b3663bb5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_0fa0d13f-974b-4a76-b32b-ad8b84930f66" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_16d1177e-2baf-4dde-8416-7592b3663bb5" xlink:to="loc_us-gaap_AwardTypeAxis_0fa0d13f-974b-4a76-b32b-ad8b84930f66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0fa0d13f-974b-4a76-b32b-ad8b84930f66_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_0fa0d13f-974b-4a76-b32b-ad8b84930f66" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0fa0d13f-974b-4a76-b32b-ad8b84930f66_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_be440fd7-3efb-4bad-940c-93a96178f2a9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_0fa0d13f-974b-4a76-b32b-ad8b84930f66" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_be440fd7-3efb-4bad-940c-93a96178f2a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_8d79204f-51e0-4ecf-be94-9b4fb987a49c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_be440fd7-3efb-4bad-940c-93a96178f2a9" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_8d79204f-51e0-4ecf-be94-9b4fb987a49c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/StockholdersEquityNarrativeDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#StockholdersEquityNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/StockholdersEquityNarrativeDetails" xlink:type="extended" id="ic2956fb4e1f24bb5a69eb7d3c24f84bf_StockholdersEquityNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_ce330313-07f7-414b-bac5-c64664ec5607" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_ce330313-07f7-414b-bac5-c64664ec5607" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_5381f962-d8e9-4b6e-a14b-8695050623c8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:to="loc_us-gaap_CommonStockSharesIssued_5381f962-d8e9-4b6e-a14b-8695050623c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_ee6f5697-2f01-4faa-86ef-7eb35e6702bc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_ee6f5697-2f01-4faa-86ef-7eb35e6702bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_6cc52b6e-2bb6-4f61-95ed-b2de6b175be1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_6cc52b6e-2bb6-4f61-95ed-b2de6b175be1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_685dd460-b4f1-49ca-ae58-c006d66001d3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_685dd460-b4f1-49ca-ae58-c006d66001d3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_fc270041-da82-48c0-8e72-69b64623699c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_fc270041-da82-48c0-8e72-69b64623699c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued_3d71209d-9dc5-4241-b6a6-e545d7a422fb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:to="loc_us-gaap_PreferredStockSharesIssued_3d71209d-9dc5-4241-b6a6-e545d7a422fb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_5241aba5-5370-4cc5-925e-b13e6479f7a5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_5241aba5-5370-4cc5-925e-b13e6479f7a5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_7ebf4997-1707-4fa9-bf98-0d86d62d1506" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_7ebf4997-1707-4fa9-bf98-0d86d62d1506" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_43f157b0-9d82-4781-b0e4-eb04c33491bc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_43f157b0-9d82-4781-b0e4-eb04c33491bc" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_2386d1ce-8e7c-4897-9862-d199f8464a51" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_2386d1ce-8e7c-4897-9862-d199f8464a51" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesinPeriodFairValue_0983012d-4438-441f-9b4b-154fe895b0c2" xlink:href="lpsn-20230331.xsd#lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesinPeriodFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:to="loc_lpsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesinPeriodFairValue_0983012d-4438-441f-9b4b-154fe895b0c2" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_acda5439-498e-495a-b270-e51ddb81c90b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_acda5439-498e-495a-b270-e51ddb81c90b" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_7f99e789-4ca4-4535-8f91-0d6826adc8cd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_7f99e789-4ca4-4535-8f91-0d6826adc8cd" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_be6325f0-a947-4a30-aab5-647836c76192" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_be6325f0-a947-4a30-aab5-647836c76192" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_752886f6-a174-4ed6-82d6-c5ad38624ce5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_752886f6-a174-4ed6-82d6-c5ad38624ce5" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ShareBasedCompensationAccrualForCashAwards_24daf876-9105-43a8-8f3b-d80968932a95" xlink:href="lpsn-20230331.xsd#lpsn_ShareBasedCompensationAccrualForCashAwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:to="loc_lpsn_ShareBasedCompensationAccrualForCashAwards_24daf876-9105-43a8-8f3b-d80968932a95" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_47c97dc1-0680-46c4-b4c5-0abb85d1e479" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_47c97dc1-0680-46c4-b4c5-0abb85d1e479" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_5ff208b1-9a78-4543-970b-0900a23d2466" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_5ff208b1-9a78-4543-970b-0900a23d2466" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_a10677c5-756d-4d62-a68f-86ce767abca0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_a10677c5-756d-4d62-a68f-86ce767abca0" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_46a6d80c-bd1f-4fc1-85c7-23b3f2361fde" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_46a6d80c-bd1f-4fc1-85c7-23b3f2361fde" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_10b5563a-d2a9-47aa-9cd9-9a5a8d5fd31d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_10b5563a-d2a9-47aa-9cd9-9a5a8d5fd31d" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_e375d17b-d9ed-4e44-a23b-5376027a9045" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_64bf9b18-811b-4588-a3f8-c779309dae7a" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_e375d17b-d9ed-4e44-a23b-5376027a9045" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_151b1cb7-0c82-406e-b9a7-72da110a848a" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_e375d17b-d9ed-4e44-a23b-5376027a9045" xlink:to="loc_srt_RangeAxis_151b1cb7-0c82-406e-b9a7-72da110a848a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_151b1cb7-0c82-406e-b9a7-72da110a848a_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_151b1cb7-0c82-406e-b9a7-72da110a848a" xlink:to="loc_srt_RangeMember_151b1cb7-0c82-406e-b9a7-72da110a848a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_b41299ea-ca44-452f-896d-81bab97443ad" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_151b1cb7-0c82-406e-b9a7-72da110a848a" xlink:to="loc_srt_RangeMember_b41299ea-ca44-452f-896d-81bab97443ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_ab04c6c1-b337-4086-8e5c-72a9e79c8d05" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_b41299ea-ca44-452f-896d-81bab97443ad" xlink:to="loc_srt_MinimumMember_ab04c6c1-b337-4086-8e5c-72a9e79c8d05" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_e18e8264-407f-4df7-a9a5-f8bb9b3b3be0" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_b41299ea-ca44-452f-896d-81bab97443ad" xlink:to="loc_srt_MaximumMember_e18e8264-407f-4df7-a9a5-f8bb9b3b3be0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_742b194b-8aeb-467c-851f-489ebbab9a84" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_e375d17b-d9ed-4e44-a23b-5376027a9045" xlink:to="loc_us-gaap_AwardTypeAxis_742b194b-8aeb-467c-851f-489ebbab9a84" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_742b194b-8aeb-467c-851f-489ebbab9a84_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_742b194b-8aeb-467c-851f-489ebbab9a84" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_742b194b-8aeb-467c-851f-489ebbab9a84_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7e195be2-aedb-4053-b7c6-9e58b5389b88" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_742b194b-8aeb-467c-851f-489ebbab9a84" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7e195be2-aedb-4053-b7c6-9e58b5389b88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_d653133b-3d25-44d3-92a4-77962725b116" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7e195be2-aedb-4053-b7c6-9e58b5389b88" xlink:to="loc_us-gaap_EmployeeStockOptionMember_d653133b-3d25-44d3-92a4-77962725b116" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_EmployeeStockPurchasePlanMember_c613d5dd-3ce8-4f68-8e67-213b793e08b7" xlink:href="lpsn-20230331.xsd#lpsn_EmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7e195be2-aedb-4053-b7c6-9e58b5389b88" xlink:to="loc_lpsn_EmployeeStockPurchasePlanMember_c613d5dd-3ce8-4f68-8e67-213b793e08b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_IncentiveStockOptionMember_e0d3b871-45d2-491b-9b1a-831139908a8e" xlink:href="lpsn-20230331.xsd#lpsn_IncentiveStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7e195be2-aedb-4053-b7c6-9e58b5389b88" xlink:to="loc_lpsn_IncentiveStockOptionMember_e0d3b871-45d2-491b-9b1a-831139908a8e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_aaa0cbcf-8f5e-44c9-94b1-5722b1bd3bd3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7e195be2-aedb-4053-b7c6-9e58b5389b88" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_aaa0cbcf-8f5e-44c9-94b1-5722b1bd3bd3" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/RestructuringScheduleofRestructuringandRelatedCostsDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#RestructuringScheduleofRestructuringandRelatedCostsDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/RestructuringScheduleofRestructuringandRelatedCostsDetails" xlink:type="extended" id="i4c58a7c14ee14b52aba4f3946c541e86_RestructuringScheduleofRestructuringandRelatedCostsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_7f3e2084-1e08-4e2a-8aa6-40710b9d6f7b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_05bb85bd-6fbb-4333-8a4e-0bd3070151f2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_7f3e2084-1e08-4e2a-8aa6-40710b9d6f7b" xlink:to="loc_us-gaap_RestructuringCharges_05bb85bd-6fbb-4333-8a4e-0bd3070151f2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_640fea58-927b-4448-82aa-2e7124df1c42" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_7f3e2084-1e08-4e2a-8aa6-40710b9d6f7b" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_640fea58-927b-4448-82aa-2e7124df1c42" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_aa4e06a0-bbf7-4d71-9b00-e2f9c38fb5f1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_640fea58-927b-4448-82aa-2e7124df1c42" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_aa4e06a0-bbf7-4d71-9b00-e2f9c38fb5f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_aa4e06a0-bbf7-4d71-9b00-e2f9c38fb5f1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_aa4e06a0-bbf7-4d71-9b00-e2f9c38fb5f1" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_aa4e06a0-bbf7-4d71-9b00-e2f9c38fb5f1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_7a4359f7-18d1-422c-96c6-396c2bfd5dcb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_aa4e06a0-bbf7-4d71-9b00-e2f9c38fb5f1" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_7a4359f7-18d1-422c-96c6-396c2bfd5dcb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringMember_808e05b8-121e-4e17-b8b6-75d6fb80916f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherRestructuringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_7a4359f7-18d1-422c-96c6-396c2bfd5dcb" xlink:to="loc_us-gaap_OtherRestructuringMember_808e05b8-121e-4e17-b8b6-75d6fb80916f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_587b46b8-d638-485d-8c8c-af536730647c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_7a4359f7-18d1-422c-96c6-396c2bfd5dcb" xlink:to="loc_us-gaap_EmployeeSeveranceMember_587b46b8-d638-485d-8c8c-af536730647c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_OtherRestructuring.OtherLeaseRestructuringMember_10890f0f-9e1b-4408-9860-b8cac40cd2ec" xlink:href="lpsn-20230331.xsd#lpsn_OtherRestructuring.OtherLeaseRestructuringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_7a4359f7-18d1-422c-96c6-396c2bfd5dcb" xlink:to="loc_lpsn_OtherRestructuring.OtherLeaseRestructuringMember_10890f0f-9e1b-4408-9860-b8cac40cd2ec" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/IncomeTaxesDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#IncomeTaxesDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/IncomeTaxesDetails" xlink:type="extended" id="i7154bfdf27cc40db985bdccddd1bf5ca_IncomeTaxesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxContingencyLineItems_1cc80c20-f53a-471c-9049-2c977254e7dc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxContingencyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_5ec173ee-f738-4fd3-81b3-9fdc4330061b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_1cc80c20-f53a-471c-9049-2c977254e7dc" xlink:to="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_5ec173ee-f738-4fd3-81b3-9fdc4330061b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_58e2989e-cede-4783-9844-b56f906e9026" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_1cc80c20-f53a-471c-9049-2c977254e7dc" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_58e2989e-cede-4783-9844-b56f906e9026" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_cf91f22f-5af8-43d9-a0a8-07042ffb3cb7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_1cc80c20-f53a-471c-9049-2c977254e7dc" xlink:to="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_cf91f22f-5af8-43d9-a0a8-07042ffb3cb7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationTaxSettlementsForeign_4e0913b0-8e05-4622-a84f-aa97708365ff" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxReconciliationTaxSettlementsForeign"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_1cc80c20-f53a-471c-9049-2c977254e7dc" xlink:to="loc_us-gaap_IncomeTaxReconciliationTaxSettlementsForeign_4e0913b0-8e05-4622-a84f-aa97708365ff" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_8949c156-3598-48ba-aee8-873179eef503" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_1cc80c20-f53a-471c-9049-2c977254e7dc" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_8949c156-3598-48ba-aee8-873179eef503" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ValuationAllowanceDeferredTaxAssetIncreaseGross_274ff6ef-8062-4b9d-92cb-8e6fee2bf3ed" xlink:href="lpsn-20230331.xsd#lpsn_ValuationAllowanceDeferredTaxAssetIncreaseGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_1cc80c20-f53a-471c-9049-2c977254e7dc" xlink:to="loc_lpsn_ValuationAllowanceDeferredTaxAssetIncreaseGross_274ff6ef-8062-4b9d-92cb-8e6fee2bf3ed" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ValuationAllowanceDeferredTaxAssetDecreaseGross_584ea2cb-5851-4380-b690-cd1ec7770d37" xlink:href="lpsn-20230331.xsd#lpsn_ValuationAllowanceDeferredTaxAssetDecreaseGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_1cc80c20-f53a-471c-9049-2c977254e7dc" xlink:to="loc_lpsn_ValuationAllowanceDeferredTaxAssetDecreaseGross_584ea2cb-5851-4380-b690-cd1ec7770d37" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxContingencyTable_f40168b6-1195-4b52-9768-66f3150302db" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxContingencyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_1cc80c20-f53a-471c-9049-2c977254e7dc" xlink:to="loc_us-gaap_IncomeTaxContingencyTable_f40168b6-1195-4b52-9768-66f3150302db" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_96a4900b-4522-4937-9cb6-215300e3dce2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_f40168b6-1195-4b52-9768-66f3150302db" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_96a4900b-4522-4937-9cb6-215300e3dce2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_96a4900b-4522-4937-9cb6-215300e3dce2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_96a4900b-4522-4937-9cb6-215300e3dce2" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_96a4900b-4522-4937-9cb6-215300e3dce2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_c26e6f85-20f4-4973-be51-e73e1e944d3f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_96a4900b-4522-4937-9cb6-215300e3dce2" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_c26e6f85-20f4-4973-be51-e73e1e944d3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_068eb8db-728a-4542-9a04-227ea7797171" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ForeignCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_c26e6f85-20f4-4973-be51-e73e1e944d3f" xlink:to="loc_us-gaap_ForeignCountryMember_068eb8db-728a-4542-9a04-227ea7797171" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_57e3410c-1bf0-454d-bf0e-a4272947e65e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_f40168b6-1195-4b52-9768-66f3150302db" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_57e3410c-1bf0-454d-bf0e-a4272947e65e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_57e3410c-1bf0-454d-bf0e-a4272947e65e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfAdoptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_57e3410c-1bf0-454d-bf0e-a4272947e65e" xlink:to="loc_us-gaap_TypeOfAdoptionMember_57e3410c-1bf0-454d-bf0e-a4272947e65e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_77272a70-4d16-4b01-90e8-fca017836468" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfAdoptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_57e3410c-1bf0-454d-bf0e-a4272947e65e" xlink:to="loc_us-gaap_TypeOfAdoptionMember_77272a70-4d16-4b01-90e8-fca017836468" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingStandardsUpdate202006Member_3abc5772-1ba4-409c-874b-6d057f4b6f56" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountingStandardsUpdate202006Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_77272a70-4d16-4b01-90e8-fca017836468" xlink:to="loc_us-gaap_AccountingStandardsUpdate202006Member_3abc5772-1ba4-409c-874b-6d057f4b6f56" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_a66f8f6f-84cd-41b3-aec3-039ef5fe28e6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_f40168b6-1195-4b52-9768-66f3150302db" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_a66f8f6f-84cd-41b3-aec3-039ef5fe28e6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_a66f8f6f-84cd-41b3-aec3-039ef5fe28e6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_a66f8f6f-84cd-41b3-aec3-039ef5fe28e6" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_a66f8f6f-84cd-41b3-aec3-039ef5fe28e6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_82ce6a01-eae5-444a-9753-562d0d0cacda" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_a66f8f6f-84cd-41b3-aec3-039ef5fe28e6" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_82ce6a01-eae5-444a-9753-562d0d0cacda" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_KasambaIncMember_ef2a3895-3e32-4601-8b1a-2e0884d6f062" xlink:href="lpsn-20230331.xsd#lpsn_KasambaIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_82ce6a01-eae5-444a-9753-562d0d0cacda" xlink:to="loc_lpsn_KasambaIncMember_ef2a3895-3e32-4601-8b1a-2e0884d6f062" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/EquityMethodInvestmentsDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#EquityMethodInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/EquityMethodInvestmentsDetails" xlink:type="extended" id="i206e6db8275246b9a6b73915cfa01f53_EquityMethodInvestmentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_b7d71e50-4a0a-4eef-b6d3-c96379d14382" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_e08e2bf8-ca4f-4e47-8bad-b9d6060639b4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquireEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_b7d71e50-4a0a-4eef-b6d3-c96379d14382" xlink:to="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_e08e2bf8-ca4f-4e47-8bad-b9d6060639b4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_9ea8c68e-d986-4d1c-820b-f19d3e1398f8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_b7d71e50-4a0a-4eef-b6d3-c96379d14382" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_9ea8c68e-d986-4d1c-820b-f19d3e1398f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DueToAffiliateCurrentAndNoncurrent_cb83869d-f176-4bb6-b8fc-5b1c9e5e907c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DueToAffiliateCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_b7d71e50-4a0a-4eef-b6d3-c96379d14382" xlink:to="loc_us-gaap_DueToAffiliateCurrentAndNoncurrent_cb83869d-f176-4bb6-b8fc-5b1c9e5e907c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingIncomeExpenseNet_6d62f450-bb6e-4ee8-b5cc-40380ba6354a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherOperatingIncomeExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_b7d71e50-4a0a-4eef-b6d3-c96379d14382" xlink:to="loc_us-gaap_OtherOperatingIncomeExpenseNet_6d62f450-bb6e-4ee8-b5cc-40380ba6354a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_1d2a0751-1732-41cb-a72e-54cadfce1819" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_b7d71e50-4a0a-4eef-b6d3-c96379d14382" xlink:to="loc_us-gaap_EquityMethodInvestments_1d2a0751-1732-41cb-a72e-54cadfce1819" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_bf147e1c-2ae3-4321-9f32-bbb34d9ba4fa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_b7d71e50-4a0a-4eef-b6d3-c96379d14382" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_bf147e1c-2ae3-4321-9f32-bbb34d9ba4fa" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_598aa8a3-5982-4d43-a185-f1f6763043d0" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_bf147e1c-2ae3-4321-9f32-bbb34d9ba4fa" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_598aa8a3-5982-4d43-a185-f1f6763043d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_598aa8a3-5982-4d43-a185-f1f6763043d0_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_598aa8a3-5982-4d43-a185-f1f6763043d0" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_598aa8a3-5982-4d43-a185-f1f6763043d0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_e1989035-9050-4c06-b472-777f7227e6e4" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_598aa8a3-5982-4d43-a185-f1f6763043d0" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_e1989035-9050-4c06-b472-777f7227e6e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_ClaireHoldingsIncMember_c4d32cf2-71ed-47f6-9aa9-de95d57a903a" xlink:href="lpsn-20230331.xsd#lpsn_ClaireHoldingsIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_e1989035-9050-4c06-b472-777f7227e6e4" xlink:to="loc_lpsn_ClaireHoldingsIncMember_c4d32cf2-71ed-47f6-9aa9-de95d57a903a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_46019265-02b9-4a1e-a60d-74e1d47a6d41" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_bf147e1c-2ae3-4321-9f32-bbb34d9ba4fa" xlink:to="loc_srt_CounterpartyNameAxis_46019265-02b9-4a1e-a60d-74e1d47a6d41" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_46019265-02b9-4a1e-a60d-74e1d47a6d41_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_46019265-02b9-4a1e-a60d-74e1d47a6d41" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_46019265-02b9-4a1e-a60d-74e1d47a6d41_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_c9142469-7253-4dbd-bdad-933132a31c44" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_46019265-02b9-4a1e-a60d-74e1d47a6d41" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_c9142469-7253-4dbd-bdad-933132a31c44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_PasacaCapitalIncPasacaMember_6ac640e6-7082-46a4-9427-c9786e174d97" xlink:href="lpsn-20230331.xsd#lpsn_PasacaCapitalIncPasacaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_c9142469-7253-4dbd-bdad-933132a31c44" xlink:to="loc_lpsn_PasacaCapitalIncPasacaMember_6ac640e6-7082-46a4-9427-c9786e174d97" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/DivestitureNarrativeDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#DivestitureNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/DivestitureNarrativeDetails" xlink:type="extended" id="i75c255fd092d4f6b848a4f768d139302_DivestitureNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_952fb42f-5eb5-4110-9829-07239f14057f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_6d266ee2-7367-4654-94bf-5577500453f0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_952fb42f-5eb5-4110-9829-07239f14057f" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_6d266ee2-7367-4654-94bf-5577500453f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_DeferredProceedsFromDivestitureOfBusiness_87b6e03e-ae12-44b3-a3f6-6c1467493afb" xlink:href="lpsn-20230331.xsd#lpsn_DeferredProceedsFromDivestitureOfBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_952fb42f-5eb5-4110-9829-07239f14057f" xlink:to="loc_lpsn_DeferredProceedsFromDivestitureOfBusiness_87b6e03e-ae12-44b3-a3f6-6c1467493afb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCash_4d4c2b2c-af81-47a0-8c69-ad89aa2d46f6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_952fb42f-5eb5-4110-9829-07239f14057f" xlink:to="loc_us-gaap_RestrictedCash_4d4c2b2c-af81-47a0-8c69-ad89aa2d46f6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_MaximumLengthOfTimeRestrictedCashHeldInEscrow_7b45e882-1f58-4354-bee7-5b3a77216c47" xlink:href="lpsn-20230331.xsd#lpsn_MaximumLengthOfTimeRestrictedCashHeldInEscrow"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_952fb42f-5eb5-4110-9829-07239f14057f" xlink:to="loc_lpsn_MaximumLengthOfTimeRestrictedCashHeldInEscrow_7b45e882-1f58-4354-bee7-5b3a77216c47" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_4b2d5050-670f-4262-987b-cd3cafaa6726" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainLossOnSaleOfBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_952fb42f-5eb5-4110-9829-07239f14057f" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_4b2d5050-670f-4262-987b-cd3cafaa6726" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_00ef630d-fe58-4107-bc02-08437780e8a2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_952fb42f-5eb5-4110-9829-07239f14057f" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_00ef630d-fe58-4107-bc02-08437780e8a2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_3686a09b-00d3-408c-9536-7e9527cbceea" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_00ef630d-fe58-4107-bc02-08437780e8a2" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_3686a09b-00d3-408c-9536-7e9527cbceea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_3686a09b-00d3-408c-9536-7e9527cbceea_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_3686a09b-00d3-408c-9536-7e9527cbceea" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_3686a09b-00d3-408c-9536-7e9527cbceea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_7bae40d1-5f84-4b7e-a204-26b60e554c5b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_3686a09b-00d3-408c-9536-7e9527cbceea" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_7bae40d1-5f84-4b7e-a204-26b60e554c5b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_1d9e3374-4872-43b4-9b30-5da13f1ed7a3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_7bae40d1-5f84-4b7e-a204-26b60e554c5b" xlink:to="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_1d9e3374-4872-43b4-9b30-5da13f1ed7a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_bf9901d3-d1e8-4f78-aa89-09bd42ea4da7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_00ef630d-fe58-4107-bc02-08437780e8a2" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_bf9901d3-d1e8-4f78-aa89-09bd42ea4da7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_bf9901d3-d1e8-4f78-aa89-09bd42ea4da7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_bf9901d3-d1e8-4f78-aa89-09bd42ea4da7" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_bf9901d3-d1e8-4f78-aa89-09bd42ea4da7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_721b41c8-ac91-4c55-8af4-ba5b1421f409" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_bf9901d3-d1e8-4f78-aa89-09bd42ea4da7" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_721b41c8-ac91-4c55-8af4-ba5b1421f409" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_KasambaIncMember_9efa529c-c880-467f-84be-e2f3a615088d" xlink:href="lpsn-20230331.xsd#lpsn_KasambaIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_721b41c8-ac91-4c55-8af4-ba5b1421f409" xlink:to="loc_lpsn_KasambaIncMember_9efa529c-c880-467f-84be-e2f3a615088d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.liveperson.com/role/DivestitureScheduleofAssetsandLiabilitiesSoldDetails" xlink:type="simple" xlink:href="lpsn-20230331.xsd#DivestitureScheduleofAssetsandLiabilitiesSoldDetails"/>
  <link:definitionLink xlink:role="http://www.liveperson.com/role/DivestitureScheduleofAssetsandLiabilitiesSoldDetails" xlink:type="extended" id="i3e17efad90964215bdffe2590c6fa3f3_DivestitureScheduleofAssetsandLiabilitiesSoldDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_cabad313-5e9a-4fdd-880e-af4f7d77bc4e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_b482c683-d241-4c15-b35c-ab91e580b811" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_cabad313-5e9a-4fdd-880e-af4f7d77bc4e" xlink:to="loc_us-gaap_AssetsAbstract_b482c683-d241-4c15-b35c-ab91e580b811" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Cash_899634d1-336a-4dac-8b74-8cf401b66908" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Cash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_b482c683-d241-4c15-b35c-ab91e580b811" xlink:to="loc_us-gaap_Cash_899634d1-336a-4dac-8b74-8cf401b66908" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsAndOtherReceivablesNetCurrent_9335d5fb-2b63-47ef-a9a2-198344ff84b9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsAndOtherReceivablesNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_b482c683-d241-4c15-b35c-ab91e580b811" xlink:to="loc_us-gaap_AccountsAndOtherReceivablesNetCurrent_9335d5fb-2b63-47ef-a9a2-198344ff84b9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_7205b2ef-870f-40a6-bff7-1f079b8c166f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_b482c683-d241-4c15-b35c-ab91e580b811" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_7205b2ef-870f-40a6-bff7-1f079b8c166f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_b5838cba-3237-42c4-a62f-76546a90c7db" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_b482c683-d241-4c15-b35c-ab91e580b811" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_b5838cba-3237-42c4-a62f-76546a90c7db" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_75e1fcf0-40a0-4b49-b32d-b3b42dadc398" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_b482c683-d241-4c15-b35c-ab91e580b811" xlink:to="loc_us-gaap_Goodwill_75e1fcf0-40a0-4b49-b32d-b3b42dadc398" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxAssets_05784a31-427c-4111-a47f-095c5cb2b62a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_b482c683-d241-4c15-b35c-ab91e580b811" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxAssets_05784a31-427c-4111-a47f-095c5cb2b62a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_b8e0465e-7bb7-4b9e-b60b-fc5a1c953959" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_b482c683-d241-4c15-b35c-ab91e580b811" xlink:to="loc_us-gaap_OtherAssets_b8e0465e-7bb7-4b9e-b60b-fc5a1c953959" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_32b65ee7-6892-498c-9927-2ea650e3e966" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_b482c683-d241-4c15-b35c-ab91e580b811" xlink:to="loc_us-gaap_Assets_32b65ee7-6892-498c-9927-2ea650e3e966" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_c70bb492-28fe-4a21-bdb4-af5596a61f62" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_cabad313-5e9a-4fdd-880e-af4f7d77bc4e" xlink:to="loc_us-gaap_LiabilitiesAbstract_c70bb492-28fe-4a21-bdb4-af5596a61f62" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrentAndNoncurrent_e478aeac-564b-45bf-80d4-93f8d85eb7e4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsPayableCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_c70bb492-28fe-4a21-bdb4-af5596a61f62" xlink:to="loc_us-gaap_AccountsPayableCurrentAndNoncurrent_e478aeac-564b-45bf-80d4-93f8d85eb7e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent_920dcdfb-5a2b-420f-b862-2ce9e186eec0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_c70bb492-28fe-4a21-bdb4-af5596a61f62" xlink:to="loc_us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent_920dcdfb-5a2b-420f-b862-2ce9e186eec0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredRevenue_7b50a543-96ce-4e52-9bab-56f177e34fd8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_c70bb492-28fe-4a21-bdb4-af5596a61f62" xlink:to="loc_us-gaap_DeferredRevenue_7b50a543-96ce-4e52-9bab-56f177e34fd8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_b5def63f-ce94-491c-84ad-34913ab8f07d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_c70bb492-28fe-4a21-bdb4-af5596a61f62" xlink:to="loc_us-gaap_Liabilities_b5def63f-ce94-491c-84ad-34913ab8f07d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_6d2ee912-ce2e-4f6b-87e1-34422518b5ba" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_cabad313-5e9a-4fdd-880e-af4f7d77bc4e" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_6d2ee912-ce2e-4f6b-87e1-34422518b5ba" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_10c4edbf-1e06-4122-96bb-a1388ad10796" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_6d2ee912-ce2e-4f6b-87e1-34422518b5ba" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_10c4edbf-1e06-4122-96bb-a1388ad10796" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_10c4edbf-1e06-4122-96bb-a1388ad10796_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_10c4edbf-1e06-4122-96bb-a1388ad10796" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_10c4edbf-1e06-4122-96bb-a1388ad10796_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_b113525a-45fe-42c8-a128-d35545aeabdc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_10c4edbf-1e06-4122-96bb-a1388ad10796" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_b113525a-45fe-42c8-a128-d35545aeabdc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_c815b412-2996-48b5-b43c-74fb2f93b9a8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_b113525a-45fe-42c8-a128-d35545aeabdc" xlink:to="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_c815b412-2996-48b5-b43c-74fb2f93b9a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_d3b255e7-6583-498d-a7ee-503b7fc9f1c6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_6d2ee912-ce2e-4f6b-87e1-34422518b5ba" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_d3b255e7-6583-498d-a7ee-503b7fc9f1c6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_d3b255e7-6583-498d-a7ee-503b7fc9f1c6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_d3b255e7-6583-498d-a7ee-503b7fc9f1c6" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_d3b255e7-6583-498d-a7ee-503b7fc9f1c6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_3d71ef1d-c9dd-468a-a007-5926b0b47aa9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_d3b255e7-6583-498d-a7ee-503b7fc9f1c6" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_3d71ef1d-c9dd-468a-a007-5926b0b47aa9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpsn_KasambaIncMember_a0ddfd67-4389-4a35-b9ef-1c519cc2fe72" xlink:href="lpsn-20230331.xsd#lpsn_KasambaIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_3d71ef1d-c9dd-468a-a007-5926b0b47aa9" xlink:to="loc_lpsn_KasambaIncMember_a0ddfd67-4389-4a35-b9ef-1c519cc2fe72" xlink:type="arc" order="0"/>
  </link:definitionLink>
</link:linkbase>
