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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e2319-bc82-7146-84ed-83a13c5e2d18,g:8cf72299-5a73-4ec6-af33-e60b2af6e2e2-->
<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.akamai.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" xlink:type="simple" xlink:href="akam-20260630.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e2319-be01-7487-8dbf-e25b6cc6a730" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e2319-be01-7645-8af2-94eb819dce0b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019e2319-be01-7487-8dbf-e25b6cc6a730" xlink:to="loc_us-gaap_StatementTable_019e2319-be01-7645-8af2-94eb819dce0b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019e2319-be01-77e8-bc49-0d796849e150" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019e2319-be01-7645-8af2-94eb819dce0b" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019e2319-be01-77e8-bc49-0d796849e150" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e2319-be01-77e8-bc49-0d796849e150_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e2319-be01-77e8-bc49-0d796849e150" xlink:to="loc_us-gaap_EquityComponentDomain_019e2319-be01-77e8-bc49-0d796849e150_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e2319-be01-78cb-b96a-a04bee813314" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e2319-be01-77e8-bc49-0d796849e150" xlink:to="loc_us-gaap_EquityComponentDomain_019e2319-be01-78cb-b96a-a04bee813314" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019e2319-be01-7a3f-9e4b-b15676d31fc7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e2319-be01-78cb-b96a-a04bee813314" xlink:to="loc_us-gaap_CommonStockMember_019e2319-be01-7a3f-9e4b-b15676d31fc7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019e2319-be01-7455-9d7e-5749881dfc01" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e2319-be01-78cb-b96a-a04bee813314" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019e2319-be01-7455-9d7e-5749881dfc01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e2319-be01-7084-b5a0-5dfc9fb600f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e2319-be01-78cb-b96a-a04bee813314" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e2319-be01-7084-b5a0-5dfc9fb600f6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_019e2319-be01-784f-8db5-5cd4583626b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e2319-be01-78cb-b96a-a04bee813314" xlink:to="loc_us-gaap_TreasuryStockCommonMember_019e2319-be01-784f-8db5-5cd4583626b1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019e2319-be01-7bbb-b3bf-833bd766435b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e2319-be01-78cb-b96a-a04bee813314" xlink:to="loc_us-gaap_RetainedEarningsMember_019e2319-be01-7bbb-b3bf-833bd766435b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2319-be01-776c-9979-181594166740" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e2319-be01-7487-8dbf-e25b6cc6a730" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2319-be01-776c-9979-181594166740" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019e2319-be01-766f-bdbc-e05ed9a5f4ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2319-be01-776c-9979-181594166740" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019e2319-be01-766f-bdbc-e05ed9a5f4ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e2319-be01-7840-8b0a-f0f535483224" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2319-be01-776c-9979-181594166740" xlink:to="loc_us-gaap_StockholdersEquity_019e2319-be01-7840-8b0a-f0f535483224" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_StockIssuedDuringPeriodSharesVestingOfRestrictedAndDeferredStockUnits_019e2319-be01-79b9-8999-014988685cdb" xlink:href="akam-20260630.xsd#akam_StockIssuedDuringPeriodSharesVestingOfRestrictedAndDeferredStockUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2319-be01-776c-9979-181594166740" xlink:to="loc_akam_StockIssuedDuringPeriodSharesVestingOfRestrictedAndDeferredStockUnits_019e2319-be01-79b9-8999-014988685cdb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_StockIssuedDuringPeriodValueVestingOfRestrictedAndDeferredStockUnits_019e2319-be01-7a00-9c9c-044d81128943" xlink:href="akam-20260630.xsd#akam_StockIssuedDuringPeriodValueVestingOfRestrictedAndDeferredStockUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2319-be01-776c-9979-181594166740" xlink:to="loc_akam_StockIssuedDuringPeriodValueVestingOfRestrictedAndDeferredStockUnits_019e2319-be01-7a00-9c9c-044d81128943" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_019e8358-0d38-78b0-a6e5-8592ef7f3b95" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2319-be01-776c-9979-181594166740" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_019e8358-0d38-78b0-a6e5-8592ef7f3b95" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_019e835d-9ec6-7a1e-9347-4f958f989f33" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2319-be01-776c-9979-181594166740" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_019e835d-9ec6-7a1e-9347-4f958f989f33" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019e2319-be01-75fb-b4fb-689f92262731" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2319-be01-776c-9979-181594166740" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019e2319-be01-75fb-b4fb-689f92262731" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued_019e835e-fed2-7348-a832-8f735f2eea47" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2319-be01-776c-9979-181594166740" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued_019e835e-fed2-7348-a832-8f735f2eea47" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleDebtDeferredTaxes_019e835e-fed2-70b7-b188-e5da211257e1" xlink:href="akam-20260630.xsd#akam_ConvertibleDebtDeferredTaxes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2319-be01-776c-9979-181594166740" xlink:to="loc_akam_ConvertibleDebtDeferredTaxes_019e835e-fed2-70b7-b188-e5da211257e1" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_AdjustmentsToAdditionalPaidInCapitalPurchaseOfNoteHedgeRelatedToConvertibleSeniorNotes_019e835e-fed2-7c1e-82e2-57e57ec89e91" xlink:href="akam-20260630.xsd#akam_AdjustmentsToAdditionalPaidInCapitalPurchaseOfNoteHedgeRelatedToConvertibleSeniorNotes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2319-be01-776c-9979-181594166740" xlink:to="loc_akam_AdjustmentsToAdditionalPaidInCapitalPurchaseOfNoteHedgeRelatedToConvertibleSeniorNotes_019e835e-fed2-7c1e-82e2-57e57ec89e91" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_019e2319-be01-76f3-8d79-df1401d7a3de" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2319-be01-776c-9979-181594166740" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_019e2319-be01-76f3-8d79-df1401d7a3de" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019e2319-be01-7e22-9cd0-2e75ca74d083" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2319-be01-776c-9979-181594166740" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019e2319-be01-7e22-9cd0-2e75ca74d083" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued_019e2319-be01-75c6-802a-1c659448bf41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2319-be01-776c-9979-181594166740" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued_019e2319-be01-75c6-802a-1c659448bf41" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued_019e2319-be01-7702-b779-987e5111f5ac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2319-be01-776c-9979-181594166740" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued_019e2319-be01-7702-b779-987e5111f5ac" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e2319-be01-7542-916d-812534689253" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2319-be01-776c-9979-181594166740" xlink:to="loc_us-gaap_NetIncomeLoss_019e2319-be01-7542-916d-812534689253" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_019e2319-be01-7542-8998-35a349444c17" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2319-be01-776c-9979-181594166740" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_019e2319-be01-7542-8998-35a349444c17" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_019e2319-be01-7f6d-a97d-4fa53ee136cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2319-be01-776c-9979-181594166740" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_019e2319-be01-7f6d-a97d-4fa53ee136cf" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019e2319-be01-70bc-980c-31276ec1c68b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e2319-be01-72e2-ad70-5a63dad8a8b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/InvestmentsandFairValueMeasurementsScheduleofAvailableforSaleMarketableSecuritiesHeldDetails" xlink:type="simple" xlink:href="akam-20260630.xsd#InvestmentsandFairValueMeasurementsScheduleofAvailableforSaleMarketableSecuritiesHeldDetails"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/InvestmentsandFairValueMeasurementsScheduleofAvailableforSaleMarketableSecuritiesHeldDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketableSecuritiesLineItems_019e2319-be01-77ee-803d-f9c43887cac4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketableSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketableSecuritiesTable_019e2319-be01-74c7-b5c8-ab4225761bb7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketableSecuritiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_MarketableSecuritiesLineItems_019e2319-be01-77ee-803d-f9c43887cac4" xlink:to="loc_us-gaap_MarketableSecuritiesTable_019e2319-be01-74c7-b5c8-ab4225761bb7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e2319-be01-7791-a863-b4106316860f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MarketableSecuritiesTable_019e2319-be01-74c7-b5c8-ab4225761bb7" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e2319-be01-7791-a863-b4106316860f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2319-be01-7791-a863-b4106316860f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e2319-be01-7791-a863-b4106316860f" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2319-be01-7791-a863-b4106316860f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2319-be01-712c-8da9-4cb2e391661b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e2319-be01-7791-a863-b4106316860f" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2319-be01-712c-8da9-4cb2e391661b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankTimeDepositsMember_019e2319-be01-7afb-a1cc-e3cd80e9c8fe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BankTimeDepositsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2319-be01-712c-8da9-4cb2e391661b" xlink:to="loc_us-gaap_BankTimeDepositsMember_019e2319-be01-7afb-a1cc-e3cd80e9c8fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPaperMember_019e2319-be01-734c-aba1-d3125fce308c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPaperMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2319-be01-712c-8da9-4cb2e391661b" xlink:to="loc_us-gaap_CommercialPaperMember_019e2319-be01-734c-aba1-d3125fce308c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticCorporateDebtSecuritiesMember_019e2319-be01-729e-b0ac-5b9e75a15b2d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DomesticCorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2319-be01-712c-8da9-4cb2e391661b" xlink:to="loc_us-gaap_DomesticCorporateDebtSecuritiesMember_019e2319-be01-729e-b0ac-5b9e75a15b2d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_019f6f9c-68a2-78f1-b103-34cc986d82b6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2319-be01-712c-8da9-4cb2e391661b" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_019f6f9c-68a2-78f1-b103-34cc986d82b6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_019e2319-be01-7449-82f4-fbebba28a652" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketableSecuritiesLineItems_019e2319-be01-77ee-803d-f9c43887cac4" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_019e2319-be01-7449-82f4-fbebba28a652" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019e2319-be01-71de-b2ab-bcabbabc3110" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketableSecuritiesLineItems_019e2319-be01-77ee-803d-f9c43887cac4" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019e2319-be01-71de-b2ab-bcabbabc3110" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019e2319-be01-7e61-8208-692b069ed508" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketableSecuritiesLineItems_019e2319-be01-77ee-803d-f9c43887cac4" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019e2319-be01-7e61-8208-692b069ed508" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019e2319-be01-7a9f-b70b-e260749482bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketableSecuritiesLineItems_019e2319-be01-77ee-803d-f9c43887cac4" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019e2319-be01-7a9f-b70b-e260749482bc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_019e2319-be01-7c16-8b3a-b47a7388218f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketableSecuritiesLineItems_019e2319-be01-77ee-803d-f9c43887cac4" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_019e2319-be01-7c16-8b3a-b47a7388218f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent_019e2319-be01-7175-a4dd-b2790f5a2abb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketableSecuritiesLineItems_019e2319-be01-77ee-803d-f9c43887cac4" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent_019e2319-be01-7175-a4dd-b2790f5a2abb" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/InvestmentsandFairValueMeasurementsScheduleofFairValueMeasurementswithinFairValueHierarchyDetails" xlink:type="simple" xlink:href="akam-20260630.xsd#InvestmentsandFairValueMeasurementsScheduleofFairValueMeasurementswithinFairValueHierarchyDetails"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/InvestmentsandFairValueMeasurementsScheduleofFairValueMeasurementswithinFairValueHierarchyDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2319-be01-7f01-b675-1867f2addd32" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e2319-be01-7c18-9db5-c18a02eb28d3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2319-be01-7f01-b675-1867f2addd32" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e2319-be01-7c18-9db5-c18a02eb28d3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAxis_019e2319-be01-7a8c-9e08-ce3a05c5ed90" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e2319-be01-7c18-9db5-c18a02eb28d3" xlink:to="loc_us-gaap_CashAndCashEquivalentsAxis_019e2319-be01-7a8c-9e08-ce3a05c5ed90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019e2319-be01-7a8c-9e08-ce3a05c5ed90_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_019e2319-be01-7a8c-9e08-ce3a05c5ed90" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019e2319-be01-7a8c-9e08-ce3a05c5ed90_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019e2319-be01-7d74-b3fc-676b5812c479" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_019e2319-be01-7a8c-9e08-ce3a05c5ed90" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019e2319-be01-7d74-b3fc-676b5812c479" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_019e2319-be01-78f4-88b0-1f2b910dc337" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019e2319-be01-7d74-b3fc-676b5812c479" xlink:to="loc_us-gaap_MoneyMarketFundsMember_019e2319-be01-78f4-88b0-1f2b910dc337" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e2319-be01-7b55-b09a-209b400eeb69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e2319-be01-7c18-9db5-c18a02eb28d3" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e2319-be01-7b55-b09a-209b400eeb69" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e2319-be01-7b55-b09a-209b400eeb69_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e2319-be01-7b55-b09a-209b400eeb69" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e2319-be01-7b55-b09a-209b400eeb69_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e2319-be01-79d4-9bfd-a3fd2dda444a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e2319-be01-7b55-b09a-209b400eeb69" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e2319-be01-79d4-9bfd-a3fd2dda444a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019e2319-be01-7013-8872-ecf03b167d2e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e2319-be01-79d4-9bfd-a3fd2dda444a" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019e2319-be01-7013-8872-ecf03b167d2e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019e2319-be01-79ea-b761-b54c570d9449" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e2319-be01-79d4-9bfd-a3fd2dda444a" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019e2319-be01-79ea-b761-b54c570d9449" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e2319-be01-7bb7-9cf7-eb74bc6be38b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e2319-be01-7c18-9db5-c18a02eb28d3" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e2319-be01-7bb7-9cf7-eb74bc6be38b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2319-be01-7bb7-9cf7-eb74bc6be38b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e2319-be01-7bb7-9cf7-eb74bc6be38b" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2319-be01-7bb7-9cf7-eb74bc6be38b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2319-be01-7231-8b23-2d32b78c8714" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e2319-be01-7bb7-9cf7-eb74bc6be38b" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2319-be01-7231-8b23-2d32b78c8714" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankTimeDepositsMember_019e2319-be01-77ed-909c-8a62fd562bae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BankTimeDepositsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2319-be01-7231-8b23-2d32b78c8714" xlink:to="loc_us-gaap_BankTimeDepositsMember_019e2319-be01-77ed-909c-8a62fd562bae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPaperMember_019e2319-be01-7de6-8f0e-c2892674df93" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPaperMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2319-be01-7231-8b23-2d32b78c8714" xlink:to="loc_us-gaap_CommercialPaperMember_019e2319-be01-7de6-8f0e-c2892674df93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticCorporateDebtSecuritiesMember_019e2319-be01-7abf-a51a-6353d0014d19" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DomesticCorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2319-be01-7231-8b23-2d32b78c8714" xlink:to="loc_us-gaap_DomesticCorporateDebtSecuritiesMember_019e2319-be01-7abf-a51a-6353d0014d19" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MutualFundMember_019e2319-be01-7406-adc0-e3a14db3dccc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MutualFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2319-be01-7231-8b23-2d32b78c8714" xlink:to="loc_us-gaap_MutualFundMember_019e2319-be01-7406-adc0-e3a14db3dccc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_019f928a-b69e-79fc-9a0b-9e38117a7487" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2319-be01-7231-8b23-2d32b78c8714" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_019f928a-b69e-79fc-9a0b-9e38117a7487" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019e2319-be01-747e-8565-a09d2494f021" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2319-be01-7f01-b675-1867f2addd32" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019e2319-be01-747e-8565-a09d2494f021" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_DebtSecuritiesAndCashEquivalents_019e2319-be01-7c95-8dd8-c8becc26d27b" xlink:href="akam-20260630.xsd#akam_DebtSecuritiesAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2319-be01-7f01-b675-1867f2addd32" xlink:to="loc_akam_DebtSecuritiesAndCashEquivalents_019e2319-be01-7c95-8dd8-c8becc26d27b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019e2319-be01-79e5-97a4-43e3a42ae3e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2319-be01-7f01-b675-1867f2addd32" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019e2319-be01-79e5-97a4-43e3a42ae3e1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019e2319-be01-7a39-b24a-3fadfc0d156f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2319-be01-7f01-b675-1867f2addd32" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019e2319-be01-7a39-b24a-3fadfc0d156f" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/AccountsReceivableScheduleofNetAccountsReceivableDetails" xlink:type="simple" xlink:href="akam-20260630.xsd#AccountsReceivableScheduleofNetAccountsReceivableDetails"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/AccountsReceivableScheduleofNetAccountsReceivableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e2319-be01-718f-8d4c-93bffc827872" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e2319-be01-77a5-8548-2fa179a21b4b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e2319-be01-718f-8d4c-93bffc827872" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e2319-be01-77a5-8548-2fa179a21b4b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_019e2319-be01-7bb7-b601-d335b9ba9a90" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e2319-be01-77a5-8548-2fa179a21b4b" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_019e2319-be01-7bb7-b601-d335b9ba9a90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_019e2319-be01-7bb7-b601-d335b9ba9a90_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_019e2319-be01-7bb7-b601-d335b9ba9a90" xlink:to="loc_us-gaap_ReceivableTypeDomain_019e2319-be01-7bb7-b601-d335b9ba9a90_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_019e2319-be01-7581-9c50-c594cfc27df9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_019e2319-be01-7bb7-b601-d335b9ba9a90" xlink:to="loc_us-gaap_ReceivableTypeDomain_019e2319-be01-7581-9c50-c594cfc27df9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeAccountsReceivableMember_019e2319-be01-7de8-9477-ec1a75953f04" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradeAccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_019e2319-be01-7581-9c50-c594cfc27df9" xlink:to="loc_us-gaap_TradeAccountsReceivableMember_019e2319-be01-7de8-9477-ec1a75953f04" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_UnbilledAccountsReceivableMember_019e2319-be01-7f4f-b472-bc3aa8be493f" xlink:href="akam-20260630.xsd#akam_UnbilledAccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_019e2319-be01-7581-9c50-c594cfc27df9" xlink:to="loc_akam_UnbilledAccountsReceivableMember_019e2319-be01-7f4f-b472-bc3aa8be493f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableGrossCurrent_019e2319-be01-7d15-8057-c0ef540aada7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsReceivableGrossCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e2319-be01-718f-8d4c-93bffc827872" xlink:to="loc_us-gaap_AccountsReceivableGrossCurrent_019e2319-be01-7d15-8057-c0ef540aada7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_019e2319-be01-785b-9a58-821b2f24a18e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e2319-be01-718f-8d4c-93bffc827872" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_019e2319-be01-785b-9a58-821b2f24a18e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_019e2319-be01-7ed1-84ba-341832e88c80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e2319-be01-718f-8d4c-93bffc827872" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_019e2319-be01-7ed1-84ba-341832e88c80" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/IncrementalCoststoObtainaContractwithaCustomerDetails" xlink:type="simple" xlink:href="akam-20260630.xsd#IncrementalCoststoObtainaContractwithaCustomerDetails"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/IncrementalCoststoObtainaContractwithaCustomerDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostLineItems_019e2319-be01-798e-a0f1-3f40cecc2b7f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostTable_019e2319-be01-794e-b062-908966ca190c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CapitalizedContractCostLineItems_019e2319-be01-798e-a0f1-3f40cecc2b7f" xlink:to="loc_us-gaap_CapitalizedContractCostTable_019e2319-be01-794e-b062-908966ca190c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfFinancialPositionLocationBalanceAxis_019e2319-be01-73c5-b31f-3fe61563ae32" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfFinancialPositionLocationBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_CapitalizedContractCostTable_019e2319-be01-794e-b062-908966ca190c" xlink:to="loc_us-gaap_StatementOfFinancialPositionLocationBalanceAxis_019e2319-be01-73c5-b31f-3fe61563ae32" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostAxis_019e2319-be01-7f5d-a7fe-b01a50416bb4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_CapitalizedContractCostTable_019e2319-be01-794e-b062-908966ca190c" xlink:to="loc_us-gaap_CapitalizedContractCostAxis_019e2319-be01-7f5d-a7fe-b01a50416bb4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostDomain_019e2319-be01-7f5d-a7fe-b01a50416bb4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CapitalizedContractCostAxis_019e2319-be01-7f5d-a7fe-b01a50416bb4" xlink:to="loc_us-gaap_CapitalizedContractCostDomain_019e2319-be01-7f5d-a7fe-b01a50416bb4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostDomain_019e2319-be01-7f87-83bb-a1d1db6a6fe1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CapitalizedContractCostAxis_019e2319-be01-7f5d-a7fe-b01a50416bb4" xlink:to="loc_us-gaap_CapitalizedContractCostDomain_019e2319-be01-7f87-83bb-a1d1db6a6fe1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_CommissionandIncentivePaymentsMember_019e2319-be01-79cc-9c9f-0a9e22b64125" xlink:href="akam-20260630.xsd#akam_CommissionandIncentivePaymentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostDomain_019e2319-be01-7f87-83bb-a1d1db6a6fe1" xlink:to="loc_akam_CommissionandIncentivePaymentsMember_019e2319-be01-79cc-9c9f-0a9e22b64125" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNet_019e2319-be01-7065-9712-71d0f9ccd900" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostLineItems_019e2319-be01-798e-a0f1-3f40cecc2b7f" xlink:to="loc_us-gaap_CapitalizedContractCostNet_019e2319-be01-7065-9712-71d0f9ccd900" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostAmortization_019e2319-be01-74e7-9fb6-886cb6b55878" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostLineItems_019e2319-be01-798e-a0f1-3f40cecc2b7f" xlink:to="loc_us-gaap_CapitalizedContractCostAmortization_019e2319-be01-74e7-9fb6-886cb6b55878" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ContractCostCapitalizedDuringPeriod_019e2319-be01-7620-af0d-0b5f2c3adb99" xlink:href="akam-20260630.xsd#akam_ContractCostCapitalizedDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostLineItems_019e2319-be01-798e-a0f1-3f40cecc2b7f" xlink:to="loc_akam_ContractCostCapitalizedDuringPeriod_019e2319-be01-7620-af0d-0b5f2c3adb99" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/IncrementalCoststoObtainaContractwithaCustomerDetails_1" xlink:type="simple" xlink:href="akam-20260630.xsd#IncrementalCoststoObtainaContractwithaCustomerDetails_1"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/IncrementalCoststoObtainaContractwithaCustomerDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostLineItems_019e2319-be01-798e-a0f1-3f40cecc2b7f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostTable_019e2319-be01-794e-b062-908966ca190c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CapitalizedContractCostLineItems_019e2319-be01-798e-a0f1-3f40cecc2b7f" xlink:to="loc_us-gaap_CapitalizedContractCostTable_019e2319-be01-794e-b062-908966ca190c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostAxis_019e2319-be01-7f5d-a7fe-b01a50416bb4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_CapitalizedContractCostTable_019e2319-be01-794e-b062-908966ca190c" xlink:to="loc_us-gaap_CapitalizedContractCostAxis_019e2319-be01-7f5d-a7fe-b01a50416bb4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostDomain_019e2319-be01-7f5d-a7fe-b01a50416bb4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CapitalizedContractCostAxis_019e2319-be01-7f5d-a7fe-b01a50416bb4" xlink:to="loc_us-gaap_CapitalizedContractCostDomain_019e2319-be01-7f5d-a7fe-b01a50416bb4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostDomain_019e2319-be01-7f87-83bb-a1d1db6a6fe1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CapitalizedContractCostAxis_019e2319-be01-7f5d-a7fe-b01a50416bb4" xlink:to="loc_us-gaap_CapitalizedContractCostDomain_019e2319-be01-7f87-83bb-a1d1db6a6fe1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_CommissionandIncentivePaymentsMember_019e2319-be01-79cc-9c9f-0a9e22b64125" xlink:href="akam-20260630.xsd#akam_CommissionandIncentivePaymentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostDomain_019e2319-be01-7f87-83bb-a1d1db6a6fe1" xlink:to="loc_akam_CommissionandIncentivePaymentsMember_019e2319-be01-79cc-9c9f-0a9e22b64125" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNet_019e2319-be01-7065-9712-71d0f9ccd900" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostLineItems_019e2319-be01-798e-a0f1-3f40cecc2b7f" xlink:to="loc_us-gaap_CapitalizedContractCostNet_019e2319-be01-7065-9712-71d0f9ccd900" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostAmortization_019e2319-be01-74e7-9fb6-886cb6b55878" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostLineItems_019e2319-be01-798e-a0f1-3f40cecc2b7f" xlink:to="loc_us-gaap_CapitalizedContractCostAmortization_019e2319-be01-74e7-9fb6-886cb6b55878" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ContractCostCapitalizedDuringPeriod_019e2319-be01-7620-af0d-0b5f2c3adb99" xlink:href="akam-20260630.xsd#akam_ContractCostCapitalizedDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostLineItems_019e2319-be01-798e-a0f1-3f40cecc2b7f" xlink:to="loc_akam_ContractCostCapitalizedDuringPeriod_019e2319-be01-7620-af0d-0b5f2c3adb99" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/AcquiredIntangibleAssetsandGoodwillScheduleofAcquiredIntangibleAssetsDetails" xlink:type="simple" xlink:href="akam-20260630.xsd#AcquiredIntangibleAssetsandGoodwillScheduleofAcquiredIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/AcquiredIntangibleAssetsandGoodwillScheduleofAcquiredIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e2319-be01-7ed1-83ce-e660317f287e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019e2319-be01-7962-ae0a-b41c94650f26" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e2319-be01-7ed1-83ce-e660317f287e" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019e2319-be01-7962-ae0a-b41c94650f26" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e2319-be01-7d3b-9349-c3fbde920140" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019e2319-be01-7962-ae0a-b41c94650f26" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e2319-be01-7d3b-9349-c3fbde920140" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e2319-be01-7d3b-9349-c3fbde920140_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e2319-be01-7d3b-9349-c3fbde920140" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e2319-be01-7d3b-9349-c3fbde920140_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e2319-be01-71c7-be6f-82ca910c2eac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e2319-be01-7d3b-9349-c3fbde920140" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e2319-be01-71c7-be6f-82ca910c2eac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_019e2319-be01-775a-96db-276fedd0c685" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e2319-be01-71c7-be6f-82ca910c2eac" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_019e2319-be01-775a-96db-276fedd0c685" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019e2319-be01-7ff2-8324-08d0c68bbbf7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e2319-be01-71c7-be6f-82ca910c2eac" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019e2319-be01-7ff2-8324-08d0c68bbbf7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_019e2319-be01-70d1-bf56-9c30d0f19824" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TrademarksAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e2319-be01-71c7-be6f-82ca910c2eac" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_019e2319-be01-70d1-bf56-9c30d0f19824" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LicensingAgreementsMember_019e2319-be01-7c2c-8263-d2bf34fd6eed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LicensingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e2319-be01-71c7-be6f-82ca910c2eac" xlink:to="loc_us-gaap_LicensingAgreementsMember_019e2319-be01-7c2c-8263-d2bf34fd6eed" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019e2319-be01-7a2e-b5b6-c15623a618e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e2319-be01-7ed1-83ce-e660317f287e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019e2319-be01-7a2e-b5b6-c15623a618e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019e2319-be01-7190-92f5-12962c822306" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e2319-be01-7ed1-83ce-e660317f287e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019e2319-be01-7190-92f5-12962c822306" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019e2319-be01-7baf-94cb-821739a9357a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e2319-be01-7ed1-83ce-e660317f287e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019e2319-be01-7baf-94cb-821739a9357a" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/AcquisitionDetails" xlink:type="simple" xlink:href="akam-20260630.xsd#AcquisitionDetails"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/AcquisitionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_019eb5ff-7c9b-788b-a741-b11db3150431" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsTable_019e2319-be02-757c-b35f-c8dc8860d3d2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_019eb5ff-7c9b-788b-a741-b11db3150431" xlink:to="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsTable_019e2319-be02-757c-b35f-c8dc8860d3d2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019eb5ff-7c9b-7364-923e-7ef61c88cffa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsTable_019e2319-be02-757c-b35f-c8dc8860d3d2" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019eb5ff-7c9b-7364-923e-7ef61c88cffa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019eb5ff-7c9b-7364-923e-7ef61c88cffa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019eb5ff-7c9b-7364-923e-7ef61c88cffa" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019eb5ff-7c9b-7364-923e-7ef61c88cffa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019eb5ff-7c9b-783d-831e-ef110b8a7d70" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019eb5ff-7c9b-7364-923e-7ef61c88cffa" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019eb5ff-7c9b-783d-831e-ef110b8a7d70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_LayerXMember_019eb5ff-7c9b-7612-84e0-42b42e327733" xlink:href="akam-20260630.xsd#akam_LayerXMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019eb5ff-7c9b-783d-831e-ef110b8a7d70" xlink:to="loc_akam_LayerXMember_019eb5ff-7c9b-7612-84e0-42b42e327733" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019eb5ff-7c9b-7c94-a2d6-d10be31e120a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsTable_019e2319-be02-757c-b35f-c8dc8860d3d2" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019eb5ff-7c9b-7c94-a2d6-d10be31e120a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019eb5ff-7c9b-7c94-a2d6-d10be31e120a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019eb5ff-7c9b-7c94-a2d6-d10be31e120a" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019eb5ff-7c9b-7c94-a2d6-d10be31e120a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019eb5ff-7c9b-7b83-9cc3-5d73f64e4bbd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019eb5ff-7c9b-7c94-a2d6-d10be31e120a" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019eb5ff-7c9b-7b83-9cc3-5d73f64e4bbd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019eb5ff-7c9b-7325-af3c-08b8005bce0f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019eb5ff-7c9b-7b83-9cc3-5d73f64e4bbd" xlink:to="loc_us-gaap_SubsequentEventMember_019eb5ff-7c9b-7325-af3c-08b8005bce0f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_019eb5ff-7c9b-7660-b617-5f3510d957b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_019eb5ff-7c9b-788b-a741-b11db3150431" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_019eb5ff-7c9b-7660-b617-5f3510d957b4" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/DebtNarrativeDetails" xlink:type="simple" xlink:href="akam-20260630.xsd#DebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/DebtNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019f6f91-6d54-7ceb-93ce-1c9368086ec9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e2319-be01-7863-a72b-bbc13a1f541d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f6f91-6d54-7ceb-93ce-1c9368086ec9" xlink:to="loc_us-gaap_DebtInstrumentTable_019e2319-be01-7863-a72b-bbc13a1f541d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019f6f91-6d54-7fd0-8833-7350a00570ae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2319-be01-7863-a72b-bbc13a1f541d" xlink:to="loc_us-gaap_DebtInstrumentAxis_019f6f91-6d54-7fd0-8833-7350a00570ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019f6f91-6d54-7fd0-8833-7350a00570ae_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019f6f91-6d54-7fd0-8833-7350a00570ae" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019f6f91-6d54-7fd0-8833-7350a00570ae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019f6f91-6d54-7178-bcc7-484c9b5fefdf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019f6f91-6d54-7fd0-8833-7350a00570ae" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019f6f91-6d54-7178-bcc7-484c9b5fefdf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2032Member_019f6f91-6d54-7f5f-aaef-e1d73a17a58f" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2032Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019f6f91-6d54-7178-bcc7-484c9b5fefdf" xlink:to="loc_akam_ConvertibleSeniorNotesDue2032Member_019f6f91-6d54-7f5f-aaef-e1d73a17a58f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2027Member_019f6f91-6d54-7c00-8889-8fed5fa14b79" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019f6f91-6d54-7178-bcc7-484c9b5fefdf" xlink:to="loc_akam_ConvertibleSeniorNotesDue2027Member_019f6f91-6d54-7c00-8889-8fed5fa14b79" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleNotesMember_019f6f91-6d54-7370-915b-884d795cd811" xlink:href="akam-20260630.xsd#akam_ConvertibleNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019f6f91-6d54-7178-bcc7-484c9b5fefdf" xlink:to="loc_akam_ConvertibleNotesMember_019f6f91-6d54-7370-915b-884d795cd811" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2025Member_019f6f91-8d3f-7202-a2fa-548ff08eabf6" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019f6f91-6d54-7178-bcc7-484c9b5fefdf" xlink:to="loc_akam_ConvertibleSeniorNotesDue2025Member_019f6f91-8d3f-7202-a2fa-548ff08eabf6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2033Member_019f6f91-ec30-72e9-9382-07a70dadf068" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2033Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019f6f91-6d54-7178-bcc7-484c9b5fefdf" xlink:to="loc_akam_ConvertibleSeniorNotesDue2033Member_019f6f91-ec30-72e9-9382-07a70dadf068" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2029Member_019f6f91-ec30-7075-bfa3-5ea5674d64a8" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019f6f91-6d54-7178-bcc7-484c9b5fefdf" xlink:to="loc_akam_ConvertibleSeniorNotesDue2029Member_019f6f91-ec30-7075-bfa3-5ea5674d64a8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2030Member_019f6f91-ec30-7299-abd8-ac430bfc4d11" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019f6f91-6d54-7178-bcc7-484c9b5fefdf" xlink:to="loc_akam_ConvertibleSeniorNotesDue2030Member_019f6f91-ec30-7299-abd8-ac430bfc4d11" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019f6f91-6d54-79b1-aad2-bc189772a41f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2319-be01-7863-a72b-bbc13a1f541d" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019f6f91-6d54-79b1-aad2-bc189772a41f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019f6f91-6d54-79b1-aad2-bc189772a41f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019f6f91-6d54-79b1-aad2-bc189772a41f" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019f6f91-6d54-79b1-aad2-bc189772a41f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019f6f91-6d54-7ecb-a0c1-0b6f1c4c59db" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019f6f91-6d54-79b1-aad2-bc189772a41f" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019f6f91-6d54-7ecb-a0c1-0b6f1c4c59db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_019f6f91-6d54-7088-ad6c-3a221e5c5765" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019f6f91-6d54-7ecb-a0c1-0b6f1c4c59db" xlink:to="loc_us-gaap_ConvertibleDebtMember_019f6f91-6d54-7088-ad6c-3a221e5c5765" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_DebtInstrumentConvertibleTermsOfConversionAxis_019f6f91-ec30-73ad-9d90-0d8888c5dcf3" xlink:href="akam-20260630.xsd#akam_DebtInstrumentConvertibleTermsOfConversionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2319-be01-7863-a72b-bbc13a1f541d" xlink:to="loc_akam_DebtInstrumentConvertibleTermsOfConversionAxis_019f6f91-ec30-73ad-9d90-0d8888c5dcf3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_DebtInstrumentConvertibleTermsOfConversionDomain_019f6f91-ec30-73ad-9d90-0d8888c5dcf3_default" xlink:href="akam-20260630.xsd#akam_DebtInstrumentConvertibleTermsOfConversionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_akam_DebtInstrumentConvertibleTermsOfConversionAxis_019f6f91-ec30-73ad-9d90-0d8888c5dcf3" xlink:to="loc_akam_DebtInstrumentConvertibleTermsOfConversionDomain_019f6f91-ec30-73ad-9d90-0d8888c5dcf3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_DebtInstrumentConvertibleTermsOfConversionDomain_019f6f91-ec30-78ce-88cd-7c3ab603ffe6" xlink:href="akam-20260630.xsd#akam_DebtInstrumentConvertibleTermsOfConversionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_akam_DebtInstrumentConvertibleTermsOfConversionAxis_019f6f91-ec30-73ad-9d90-0d8888c5dcf3" xlink:to="loc_akam_DebtInstrumentConvertibleTermsOfConversionDomain_019f6f91-ec30-78ce-88cd-7c3ab603ffe6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_DebtConversionTermsOneMember_019f6f91-ec30-70b5-9efa-39e5562aa27b" xlink:href="akam-20260630.xsd#akam_DebtConversionTermsOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_akam_DebtInstrumentConvertibleTermsOfConversionDomain_019f6f91-ec30-78ce-88cd-7c3ab603ffe6" xlink:to="loc_akam_DebtConversionTermsOneMember_019f6f91-ec30-70b5-9efa-39e5562aa27b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_DebtConversionTermsTwoMember_019f6f91-ec30-7bfd-97a7-b308115fb84d" xlink:href="akam-20260630.xsd#akam_DebtConversionTermsTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_akam_DebtInstrumentConvertibleTermsOfConversionDomain_019f6f91-ec30-78ce-88cd-7c3ab603ffe6" xlink:to="loc_akam_DebtConversionTermsTwoMember_019f6f91-ec30-7bfd-97a7-b308115fb84d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019f6f92-39fa-74aa-aaaf-5e86048dc11c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2319-be01-7863-a72b-bbc13a1f541d" xlink:to="loc_us-gaap_CreditFacilityAxis_019f6f92-39fa-74aa-aaaf-5e86048dc11c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019f6f92-39fa-74aa-aaaf-5e86048dc11c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019f6f92-39fa-74aa-aaaf-5e86048dc11c" xlink:to="loc_us-gaap_CreditFacilityDomain_019f6f92-39fa-74aa-aaaf-5e86048dc11c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019f6f92-39fa-7787-8bb2-f43d82d459e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019f6f92-39fa-74aa-aaaf-5e86048dc11c" xlink:to="loc_us-gaap_CreditFacilityDomain_019f6f92-39fa-7787-8bb2-f43d82d459e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_A2025CreditAgreementMember_019f6f92-39fa-741e-ae5c-36bed003e5b3" xlink:href="akam-20260630.xsd#akam_A2025CreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019f6f92-39fa-7787-8bb2-f43d82d459e1" xlink:to="loc_akam_A2025CreditAgreementMember_019f6f92-39fa-741e-ae5c-36bed003e5b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_A2022CreditAgreementMember_019f6f92-39fa-7192-ae6c-9e60794951a4" xlink:href="akam-20260630.xsd#akam_A2022CreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019f6f92-39fa-7787-8bb2-f43d82d459e1" xlink:to="loc_akam_A2022CreditAgreementMember_019f6f92-39fa-7192-ae6c-9e60794951a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019f6f92-39fa-7d54-b0e8-dcc54dae8103" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2319-be01-7863-a72b-bbc13a1f541d" xlink:to="loc_srt_RangeAxis_019f6f92-39fa-7d54-b0e8-dcc54dae8103" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019f6f92-39fa-7d54-b0e8-dcc54dae8103_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019f6f92-39fa-7d54-b0e8-dcc54dae8103" xlink:to="loc_srt_RangeMember_019f6f92-39fa-7d54-b0e8-dcc54dae8103_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019f6f92-39fa-7b07-ad6f-63a3b8571e58" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019f6f92-39fa-7d54-b0e8-dcc54dae8103" xlink:to="loc_srt_RangeMember_019f6f92-39fa-7b07-ad6f-63a3b8571e58" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019f6f92-39fa-7c8d-a87b-1b2b7424d4c3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019f6f92-39fa-7b07-ad6f-63a3b8571e58" xlink:to="loc_srt_MinimumMember_019f6f92-39fa-7c8d-a87b-1b2b7424d4c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019f6f92-39fa-7b2e-86cd-429d91b511fc" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019f6f92-39fa-7b07-ad6f-63a3b8571e58" xlink:to="loc_srt_MaximumMember_019f6f92-39fa-7b2e-86cd-429d91b511fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_019f6f92-39fa-73d6-9849-4762cdc2f9a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2319-be01-7863-a72b-bbc13a1f541d" xlink:to="loc_us-gaap_VariableRateAxis_019f6f92-39fa-73d6-9849-4762cdc2f9a0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019f6f92-39fa-73d6-9849-4762cdc2f9a0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_019f6f92-39fa-73d6-9849-4762cdc2f9a0" xlink:to="loc_us-gaap_VariableRateDomain_019f6f92-39fa-73d6-9849-4762cdc2f9a0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019f6f92-39fa-7ac5-abb1-09509c10a2e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_019f6f92-39fa-73d6-9849-4762cdc2f9a0" xlink:to="loc_us-gaap_VariableRateDomain_019f6f92-39fa-7ac5-abb1-09509c10a2e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_BenchmarkRateMember_019f6f92-39fa-7fb1-91ec-00d3c34f58ce" xlink:href="akam-20260630.xsd#akam_BenchmarkRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019f6f92-39fa-7ac5-abb1-09509c10a2e1" xlink:to="loc_akam_BenchmarkRateMember_019f6f92-39fa-7fb1-91ec-00d3c34f58ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ReferenceRateMember_019f6f92-39fa-78b4-9b5d-9da79e479853" xlink:href="akam-20260630.xsd#akam_ReferenceRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019f6f92-39fa-7ac5-abb1-09509c10a2e1" xlink:to="loc_akam_ReferenceRateMember_019f6f92-39fa-78b4-9b5d-9da79e479853" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_019f6f92-39fa-7ae2-826a-e7f0781bf81e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019f6f92-39fa-7ac5-abb1-09509c10a2e1" xlink:to="loc_us-gaap_BaseRateMember_019f6f92-39fa-7ae2-826a-e7f0781bf81e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019f6f91-6d54-7d9c-8da5-5b316d2c7259" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f6f91-6d54-7ceb-93ce-1c9368086ec9" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019f6f91-6d54-7d9c-8da5-5b316d2c7259" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_DebtInstrumentNumberOfInstruments_019f6f91-6d54-7fd5-8d32-4873cba6d97d" xlink:href="akam-20260630.xsd#akam_DebtInstrumentNumberOfInstruments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f6f91-6d54-7ceb-93ce-1c9368086ec9" xlink:to="loc_akam_DebtInstrumentNumberOfInstruments_019f6f91-6d54-7fd5-8d32-4873cba6d97d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019f6f91-8d3f-712c-b9e5-23d9b68731a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f6f91-6d54-7ceb-93ce-1c9368086ec9" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019f6f91-8d3f-712c-b9e5-23d9b68731a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_019f6f91-ec30-74cf-8210-0b4d0cfb9581" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentConvertibleThresholdTradingDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f6f91-6d54-7ceb-93ce-1c9368086ec9" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_019f6f91-ec30-74cf-8210-0b4d0cfb9581" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_019f6f91-ec30-7dec-94e7-f8f8e56125c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f6f91-6d54-7ceb-93ce-1c9368086ec9" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_019f6f91-ec30-7dec-94e7-f8f8e56125c9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_019f6f91-ec30-751d-bd0c-0c2ae970ca22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f6f91-6d54-7ceb-93ce-1c9368086ec9" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_019f6f91-ec30-751d-bd0c-0c2ae970ca22" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_019f6f91-ec30-746e-9e03-1bab8ae08a9c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f6f91-6d54-7ceb-93ce-1c9368086ec9" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_019f6f91-ec30-746e-9e03-1bab8ae08a9c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019f6f92-39fa-7588-9675-bad620218700" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f6f91-6d54-7ceb-93ce-1c9368086ec9" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019f6f92-39fa-7588-9675-bad620218700" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_019f6f92-39fa-7362-abe3-d7e5cd01b4b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f6f91-6d54-7ceb-93ce-1c9368086ec9" xlink:to="loc_us-gaap_LineOfCredit_019f6f92-39fa-7362-abe3-d7e5cd01b4b0" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_LineOfCreditFacilityExtensionTerm_019f6f92-39fa-7e49-b331-7e2a801ae30a" xlink:href="akam-20260630.xsd#akam_LineOfCreditFacilityExtensionTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f6f91-6d54-7ceb-93ce-1c9368086ec9" xlink:to="loc_akam_LineOfCreditFacilityExtensionTerm_019f6f92-39fa-7e49-b331-7e2a801ae30a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019f6f92-39fa-757e-b2ee-1f2a98679c8a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f6f91-6d54-7ceb-93ce-1c9368086ec9" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019f6f92-39fa-757e-b2ee-1f2a98679c8a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_019f6f92-39fa-79b8-b56f-faa9d1673c39" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f6f91-6d54-7ceb-93ce-1c9368086ec9" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_019f6f92-39fa-79b8-b56f-faa9d1673c39" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/DebtScheduleofConversionsofStockDetails" xlink:type="simple" xlink:href="akam-20260630.xsd#DebtScheduleofConversionsofStockDetails"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/DebtScheduleofConversionsofStockDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-7ace-8804-c44ed0da6e89" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e2319-be01-78e3-8d5e-3520ad834018" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-7ace-8804-c44ed0da6e89" xlink:to="loc_us-gaap_DebtInstrumentTable_019e2319-be01-78e3-8d5e-3520ad834018" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e2319-be01-726a-a275-3910b697030f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2319-be01-78e3-8d5e-3520ad834018" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e2319-be01-726a-a275-3910b697030f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-726a-a275-3910b697030f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2319-be01-726a-a275-3910b697030f" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-726a-a275-3910b697030f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-73b3-b35e-75983cbb71ee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2319-be01-726a-a275-3910b697030f" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-73b3-b35e-75983cbb71ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2033Member_019e2319-be01-7018-a7b9-4fd4740df6f0" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2033Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-73b3-b35e-75983cbb71ee" xlink:to="loc_akam_ConvertibleSeniorNotesDue2033Member_019e2319-be01-7018-a7b9-4fd4740df6f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2032Member_019eba38-5336-7da4-a7a2-90c24a9efde9" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2032Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-73b3-b35e-75983cbb71ee" xlink:to="loc_akam_ConvertibleSeniorNotesDue2032Member_019eba38-5336-7da4-a7a2-90c24a9efde9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2030Member_019eba38-869e-7fc7-813a-706135f36d35" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-73b3-b35e-75983cbb71ee" xlink:to="loc_akam_ConvertibleSeniorNotesDue2030Member_019eba38-869e-7fc7-813a-706135f36d35" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2029Member_019e2319-be01-7770-9b19-654e83adfb92" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-73b3-b35e-75983cbb71ee" xlink:to="loc_akam_ConvertibleSeniorNotesDue2029Member_019e2319-be01-7770-9b19-654e83adfb92" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2027Member_019e2319-be01-797e-8908-b430e998f159" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-73b3-b35e-75983cbb71ee" xlink:to="loc_akam_ConvertibleSeniorNotesDue2027Member_019e2319-be01-797e-8908-b430e998f159" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e2319-be01-7363-8b1a-9f650bdda1ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2319-be01-78e3-8d5e-3520ad834018" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e2319-be01-7363-8b1a-9f650bdda1ec" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2319-be01-7363-8b1a-9f650bdda1ec_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2319-be01-7363-8b1a-9f650bdda1ec" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2319-be01-7363-8b1a-9f650bdda1ec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2319-be01-7bb6-bc5a-dc90d1dd6b3e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2319-be01-7363-8b1a-9f650bdda1ec" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2319-be01-7bb6-bc5a-dc90d1dd6b3e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_019e2319-be01-7585-8e95-f7093e168772" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e2319-be01-7bb6-bc5a-dc90d1dd6b3e" xlink:to="loc_us-gaap_ConvertibleDebtMember_019e2319-be01-7585-8e95-f7093e168772" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019e2319-be01-76b6-936b-f2e497aea919" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-7ace-8804-c44ed0da6e89" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019e2319-be01-76b6-936b-f2e497aea919" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019e2319-be01-7213-8745-99391eb6118c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-7ace-8804-c44ed0da6e89" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019e2319-be01-7213-8745-99391eb6118c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019e2319-be01-7130-92bd-3e759cade8cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-7ace-8804-c44ed0da6e89" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019e2319-be01-7130-92bd-3e759cade8cb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionRatio1_019e2319-be01-7943-903e-651df12303ce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentConvertibleConversionRatio1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-7ace-8804-c44ed0da6e89" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionRatio1_019e2319-be01-7943-903e-651df12303ce" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_019e2319-be01-7546-8478-06ec5a5d39dd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-7ace-8804-c44ed0da6e89" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_019e2319-be01-7546-8478-06ec5a5d39dd" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/DebtScheduleofConvertibleSeniorNotesDetails" xlink:type="simple" xlink:href="akam-20260630.xsd#DebtScheduleofConvertibleSeniorNotesDetails"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/DebtScheduleofConvertibleSeniorNotesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-7a0a-b055-4a669f4d7551" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e2319-be01-722b-812a-8f2983147ada" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-7a0a-b055-4a669f4d7551" xlink:to="loc_us-gaap_DebtInstrumentTable_019e2319-be01-722b-812a-8f2983147ada" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e2319-be01-7a6b-a720-72339a0e70f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2319-be01-722b-812a-8f2983147ada" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e2319-be01-7a6b-a720-72339a0e70f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7a6b-a720-72339a0e70f2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2319-be01-7a6b-a720-72339a0e70f2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7a6b-a720-72339a0e70f2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7d2a-8073-50f421d2c7bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2319-be01-7a6b-a720-72339a0e70f2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7d2a-8073-50f421d2c7bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2033Member_019e2319-be01-7e68-9bdc-bf27abb86c35" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2033Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7d2a-8073-50f421d2c7bc" xlink:to="loc_akam_ConvertibleSeniorNotesDue2033Member_019e2319-be01-7e68-9bdc-bf27abb86c35" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2032Member_019eba45-949b-7892-94f5-81c7012d8c7e" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2032Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7d2a-8073-50f421d2c7bc" xlink:to="loc_akam_ConvertibleSeniorNotesDue2032Member_019eba45-949b-7892-94f5-81c7012d8c7e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2030Member_019eba45-9bb1-7c2f-ba45-32117ace002c" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7d2a-8073-50f421d2c7bc" xlink:to="loc_akam_ConvertibleSeniorNotesDue2030Member_019eba45-9bb1-7c2f-ba45-32117ace002c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2029Member_019e2319-be01-799d-b0b5-9bb5ee94dba1" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7d2a-8073-50f421d2c7bc" xlink:to="loc_akam_ConvertibleSeniorNotesDue2029Member_019e2319-be01-799d-b0b5-9bb5ee94dba1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2027Member_019e2319-be01-7b95-8a05-3d33c95709da" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7d2a-8073-50f421d2c7bc" xlink:to="loc_akam_ConvertibleSeniorNotesDue2027Member_019e2319-be01-7b95-8a05-3d33c95709da" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e2319-be01-7179-8ee1-b05444a0ca2f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2319-be01-722b-812a-8f2983147ada" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e2319-be01-7179-8ee1-b05444a0ca2f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2319-be01-7179-8ee1-b05444a0ca2f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2319-be01-7179-8ee1-b05444a0ca2f" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2319-be01-7179-8ee1-b05444a0ca2f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2319-be01-7200-bcc9-852baeb6b513" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2319-be01-7179-8ee1-b05444a0ca2f" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2319-be01-7200-bcc9-852baeb6b513" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_019e2319-be01-7bd7-bf9d-8dd212c2aca9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e2319-be01-7200-bcc9-852baeb6b513" xlink:to="loc_us-gaap_ConvertibleDebtMember_019e2319-be01-7bd7-bf9d-8dd212c2aca9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019e2319-be01-7d57-82ce-a3aab6b1901f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-7a0a-b055-4a669f4d7551" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019e2319-be01-7d57-82ce-a3aab6b1901f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019e2319-be01-7104-a56e-33629b8dcd8a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-7a0a-b055-4a669f4d7551" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019e2319-be01-7104-a56e-33629b8dcd8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019e2319-be01-7b16-9b1f-800e18baaeab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-7a0a-b055-4a669f4d7551" xlink:to="loc_us-gaap_LongTermDebt_019e2319-be01-7b16-9b1f-800e18baaeab" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_019e2319-be01-7c2b-ac36-6d5bc9b698e2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-7a0a-b055-4a669f4d7551" xlink:to="loc_us-gaap_LongTermDebtFairValue_019e2319-be01-7c2b-ac36-6d5bc9b698e2" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/DebtScheduleofNoteHedgesandWarrantsDetails" xlink:type="simple" xlink:href="akam-20260630.xsd#DebtScheduleofNoteHedgesandWarrantsDetails"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/DebtScheduleofNoteHedgesandWarrantsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-773c-9b93-9ebb10cdf2ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e2319-be01-75f2-b351-e7492f2cfa13" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-773c-9b93-9ebb10cdf2ab" xlink:to="loc_us-gaap_DebtInstrumentTable_019e2319-be01-75f2-b351-e7492f2cfa13" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e2319-be01-7fc4-9188-00c5c78b61ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2319-be01-75f2-b351-e7492f2cfa13" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e2319-be01-7fc4-9188-00c5c78b61ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7fc4-9188-00c5c78b61ba_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2319-be01-7fc4-9188-00c5c78b61ba" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7fc4-9188-00c5c78b61ba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7cb3-8215-b0e59c08913d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2319-be01-7fc4-9188-00c5c78b61ba" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7cb3-8215-b0e59c08913d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2033Member_019e2319-be01-7fc8-a538-607d8367f109" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2033Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7cb3-8215-b0e59c08913d" xlink:to="loc_akam_ConvertibleSeniorNotesDue2033Member_019e2319-be01-7fc8-a538-607d8367f109" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2032Member_019eba40-7684-7c4b-b447-2e36e944d683" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2032Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7cb3-8215-b0e59c08913d" xlink:to="loc_akam_ConvertibleSeniorNotesDue2032Member_019eba40-7684-7c4b-b447-2e36e944d683" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2030Member_019eba40-937a-7afa-aa90-c6dd4b8be9a6" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7cb3-8215-b0e59c08913d" xlink:to="loc_akam_ConvertibleSeniorNotesDue2030Member_019eba40-937a-7afa-aa90-c6dd4b8be9a6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2029Member_019e2319-be01-73aa-b48c-8263de506ffd" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7cb3-8215-b0e59c08913d" xlink:to="loc_akam_ConvertibleSeniorNotesDue2029Member_019e2319-be01-73aa-b48c-8263de506ffd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2027Member_019e2319-be01-728d-996f-159528d1739a" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7cb3-8215-b0e59c08913d" xlink:to="loc_akam_ConvertibleSeniorNotesDue2027Member_019e2319-be01-728d-996f-159528d1739a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e2319-be01-7efe-b3a5-acdf6b393b2f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2319-be01-75f2-b351-e7492f2cfa13" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e2319-be01-7efe-b3a5-acdf6b393b2f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2319-be01-7efe-b3a5-acdf6b393b2f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2319-be01-7efe-b3a5-acdf6b393b2f" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2319-be01-7efe-b3a5-acdf6b393b2f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2319-be01-7613-b0f8-fef903ebbefa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2319-be01-7efe-b3a5-acdf6b393b2f" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2319-be01-7613-b0f8-fef903ebbefa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_019e2319-be01-7475-84ce-43786417a3f7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e2319-be01-7613-b0f8-fef903ebbefa" xlink:to="loc_us-gaap_ConvertibleDebtMember_019e2319-be01-7475-84ce-43786417a3f7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForHedgeFinancingActivities_019e2319-be01-7f09-b213-ec1235575d2c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForHedgeFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-773c-9b93-9ebb10cdf2ab" xlink:to="loc_us-gaap_PaymentsForHedgeFinancingActivities_019e2319-be01-7f09-b213-ec1235575d2c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_SharesCoveredByHedgeTransaction_019e2319-be01-7bde-a492-e2bc60eee178" xlink:href="akam-20260630.xsd#akam_SharesCoveredByHedgeTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-773c-9b93-9ebb10cdf2ab" xlink:to="loc_akam_SharesCoveredByHedgeTransaction_019e2319-be01-7bde-a492-e2bc60eee178" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightOutstanding_019e2319-be01-7462-bcc2-455dceccb450" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-773c-9b93-9ebb10cdf2ab" xlink:to="loc_us-gaap_ClassOfWarrantOrRightOutstanding_019e2319-be01-7462-bcc2-455dceccb450" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_019e2319-be01-73f5-a817-560c39f5c30c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-773c-9b93-9ebb10cdf2ab" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_019e2319-be01-73f5-a817-560c39f5c30c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfWarrants_019e2319-be01-7bb3-958c-b714231eb27f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfWarrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-773c-9b93-9ebb10cdf2ab" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfWarrants_019e2319-be01-7bb3-958c-b714231eb27f" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/DebtRevolvingCreditFacilitiesNarrativeDetails" xlink:type="simple" xlink:href="akam-20260630.xsd#DebtRevolvingCreditFacilitiesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/DebtRevolvingCreditFacilitiesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-7f46-bd4e-4e5a80da65a4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e2319-be01-7b26-8415-95685583d2bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-7f46-bd4e-4e5a80da65a4" xlink:to="loc_us-gaap_DebtInstrumentTable_019e2319-be01-7b26-8415-95685583d2bc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019e2319-be01-768c-9fd5-2eeb9df49241" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2319-be01-7b26-8415-95685583d2bc" xlink:to="loc_us-gaap_CreditFacilityAxis_019e2319-be01-768c-9fd5-2eeb9df49241" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e2319-be01-768c-9fd5-2eeb9df49241_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019e2319-be01-768c-9fd5-2eeb9df49241" xlink:to="loc_us-gaap_CreditFacilityDomain_019e2319-be01-768c-9fd5-2eeb9df49241_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e2319-be01-798d-9e9f-d559ca72c127" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019e2319-be01-768c-9fd5-2eeb9df49241" xlink:to="loc_us-gaap_CreditFacilityDomain_019e2319-be01-798d-9e9f-d559ca72c127" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_A2025CreditAgreementMember_019e2319-be01-7e27-a693-5a4893b4fd3e" xlink:href="akam-20260630.xsd#akam_A2025CreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019e2319-be01-798d-9e9f-d559ca72c127" xlink:to="loc_akam_A2025CreditAgreementMember_019e2319-be01-7e27-a693-5a4893b4fd3e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_A2022CreditAgreementMember_019e2319-be01-7354-8f0d-1b5cef349821" xlink:href="akam-20260630.xsd#akam_A2022CreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019e2319-be01-798d-9e9f-d559ca72c127" xlink:to="loc_akam_A2022CreditAgreementMember_019e2319-be01-7354-8f0d-1b5cef349821" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e2319-be01-7d72-9b91-73a3dd823129" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2319-be01-7b26-8415-95685583d2bc" xlink:to="loc_srt_RangeAxis_019e2319-be01-7d72-9b91-73a3dd823129" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e2319-be01-7d72-9b91-73a3dd823129_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e2319-be01-7d72-9b91-73a3dd823129" xlink:to="loc_srt_RangeMember_019e2319-be01-7d72-9b91-73a3dd823129_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e2319-be01-7314-b817-b1f650f67e96" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e2319-be01-7d72-9b91-73a3dd823129" xlink:to="loc_srt_RangeMember_019e2319-be01-7314-b817-b1f650f67e96" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e2319-be01-76a0-8b92-23cbafa09541" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e2319-be01-7314-b817-b1f650f67e96" xlink:to="loc_srt_MinimumMember_019e2319-be01-76a0-8b92-23cbafa09541" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e2319-be01-74c5-bf17-61fd5deae346" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e2319-be01-7314-b817-b1f650f67e96" xlink:to="loc_srt_MaximumMember_019e2319-be01-74c5-bf17-61fd5deae346" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_019e2319-be01-7301-8d4c-cbcc2cb2db9e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2319-be01-7b26-8415-95685583d2bc" xlink:to="loc_us-gaap_VariableRateAxis_019e2319-be01-7301-8d4c-cbcc2cb2db9e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019e2319-be01-7301-8d4c-cbcc2cb2db9e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_019e2319-be01-7301-8d4c-cbcc2cb2db9e" xlink:to="loc_us-gaap_VariableRateDomain_019e2319-be01-7301-8d4c-cbcc2cb2db9e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019e2319-be01-73c8-b081-b92fb7e71111" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_019e2319-be01-7301-8d4c-cbcc2cb2db9e" xlink:to="loc_us-gaap_VariableRateDomain_019e2319-be01-73c8-b081-b92fb7e71111" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_BenchmarkRateMember_019e2319-be01-7c21-adb7-118b1d7e5efb" xlink:href="akam-20260630.xsd#akam_BenchmarkRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019e2319-be01-73c8-b081-b92fb7e71111" xlink:to="loc_akam_BenchmarkRateMember_019e2319-be01-7c21-adb7-118b1d7e5efb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ReferenceRateMember_019e2319-be01-77e6-8d24-53f6e9f2bd0d" xlink:href="akam-20260630.xsd#akam_ReferenceRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019e2319-be01-73c8-b081-b92fb7e71111" xlink:to="loc_akam_ReferenceRateMember_019e2319-be01-77e6-8d24-53f6e9f2bd0d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_019e2319-be01-7fce-a283-1321548045c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019e2319-be01-73c8-b081-b92fb7e71111" xlink:to="loc_us-gaap_BaseRateMember_019e2319-be01-7fce-a283-1321548045c1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019e2319-be01-7172-8dcc-ae455b502a02" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-7f46-bd4e-4e5a80da65a4" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019e2319-be01-7172-8dcc-ae455b502a02" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_019e2319-be01-7fe4-b1a2-54955584a46d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-7f46-bd4e-4e5a80da65a4" xlink:to="loc_us-gaap_LineOfCredit_019e2319-be01-7fe4-b1a2-54955584a46d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_LineOfCreditFacilityExtensionTerm_019e2319-be01-7f00-97ae-4681557fd41b" xlink:href="akam-20260630.xsd#akam_LineOfCreditFacilityExtensionTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-7f46-bd4e-4e5a80da65a4" xlink:to="loc_akam_LineOfCreditFacilityExtensionTerm_019e2319-be01-7f00-97ae-4681557fd41b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019e2319-be01-74cf-949c-1bb9691da70f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-7f46-bd4e-4e5a80da65a4" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019e2319-be01-74cf-949c-1bb9691da70f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_019e2319-be01-7428-bef4-91cd7552067f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be01-7f46-bd4e-4e5a80da65a4" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_019e2319-be01-7428-bef4-91cd7552067f" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/DebtScheduleofInterestExpenseDetails" xlink:type="simple" xlink:href="akam-20260630.xsd#DebtScheduleofInterestExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/DebtScheduleofInterestExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e2319-be02-78cf-87bc-11bd5ddc82b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e2319-be01-7d52-bd9c-c4d41ba13e39" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be02-78cf-87bc-11bd5ddc82b7" xlink:to="loc_us-gaap_DebtInstrumentTable_019e2319-be01-7d52-bd9c-c4d41ba13e39" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e2319-be01-76db-8d34-54fc85c2bba8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2319-be01-7d52-bd9c-c4d41ba13e39" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e2319-be01-76db-8d34-54fc85c2bba8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-76db-8d34-54fc85c2bba8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2319-be01-76db-8d34-54fc85c2bba8" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-76db-8d34-54fc85c2bba8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7bd1-acc9-10f80784d20d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2319-be01-76db-8d34-54fc85c2bba8" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7bd1-acc9-10f80784d20d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2033Member_019e2319-be01-74ee-9114-c5eaad2db952" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2033Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7bd1-acc9-10f80784d20d" xlink:to="loc_akam_ConvertibleSeniorNotesDue2033Member_019e2319-be01-74ee-9114-c5eaad2db952" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2029Member_019e2319-be01-7ce8-a07a-d48dc4c41074" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7bd1-acc9-10f80784d20d" xlink:to="loc_akam_ConvertibleSeniorNotesDue2029Member_019e2319-be01-7ce8-a07a-d48dc4c41074" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2027Member_019e2319-be01-72f1-b691-4d1cc9367b0a" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7bd1-acc9-10f80784d20d" xlink:to="loc_akam_ConvertibleSeniorNotesDue2027Member_019e2319-be01-72f1-b691-4d1cc9367b0a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ConvertibleSeniorNotesDue2025Member_019e2319-be01-7fd0-9be1-33385c334fc9" xlink:href="akam-20260630.xsd#akam_ConvertibleSeniorNotesDue2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2319-be01-7bd1-acc9-10f80784d20d" xlink:to="loc_akam_ConvertibleSeniorNotesDue2025Member_019e2319-be01-7fd0-9be1-33385c334fc9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e2319-be01-7ea1-a735-14dcf96d67cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2319-be01-7d52-bd9c-c4d41ba13e39" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e2319-be01-7ea1-a735-14dcf96d67cc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2319-be01-7ea1-a735-14dcf96d67cc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2319-be01-7ea1-a735-14dcf96d67cc" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2319-be01-7ea1-a735-14dcf96d67cc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2319-be02-756b-849f-76a8e1d9cd38" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2319-be01-7ea1-a735-14dcf96d67cc" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2319-be02-756b-849f-76a8e1d9cd38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_019e2319-be02-72b7-9b44-8a151394a756" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e2319-be02-756b-849f-76a8e1d9cd38" xlink:to="loc_us-gaap_ConvertibleDebtMember_019e2319-be02-72b7-9b44-8a151394a756" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019e2319-be02-74ec-98b7-f414fb2b6253" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2319-be01-7d52-bd9c-c4d41ba13e39" xlink:to="loc_us-gaap_CreditFacilityAxis_019e2319-be02-74ec-98b7-f414fb2b6253" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e2319-be02-74ec-98b7-f414fb2b6253_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019e2319-be02-74ec-98b7-f414fb2b6253" xlink:to="loc_us-gaap_CreditFacilityDomain_019e2319-be02-74ec-98b7-f414fb2b6253_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e2319-be02-7d22-a2c6-310ff675427c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019e2319-be02-74ec-98b7-f414fb2b6253" xlink:to="loc_us-gaap_CreditFacilityDomain_019e2319-be02-7d22-a2c6-310ff675427c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019e2319-be02-721c-b0e1-98925ca7b3a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019e2319-be02-7d22-a2c6-310ff675427c" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019e2319-be02-721c-b0e1-98925ca7b3a6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_AmortizationOfDebtIssuanceCostsIncludingCapitalizedInterest_019e2319-be02-73e3-abf8-4eef10638377" xlink:href="akam-20260630.xsd#akam_AmortizationOfDebtIssuanceCostsIncludingCapitalizedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be02-78cf-87bc-11bd5ddc82b7" xlink:to="loc_akam_AmortizationOfDebtIssuanceCostsIncludingCapitalizedInterest_019e2319-be02-73e3-abf8-4eef10638377" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentIncreaseAccruedInterest_019e2319-be02-7e70-a5f6-816a42f8bba9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentIncreaseAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be02-78cf-87bc-11bd5ddc82b7" xlink:to="loc_us-gaap_DebtInstrumentIncreaseAccruedInterest_019e2319-be02-7e70-a5f6-816a42f8bba9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestCostsCapitalizedAdjustment_019e2319-be02-72e1-b97e-4f11934134cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestCostsCapitalizedAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be02-78cf-87bc-11bd5ddc82b7" xlink:to="loc_us-gaap_InterestCostsCapitalizedAdjustment_019e2319-be02-72e1-b97e-4f11934134cf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_019e2319-be02-72ce-97ba-139545df6304" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2319-be02-78cf-87bc-11bd5ddc82b7" xlink:to="loc_us-gaap_InterestExpenseDebt_019e2319-be02-72ce-97ba-139545df6304" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/RestructuringScheduleofRestructuringchargesDetails" xlink:type="simple" xlink:href="akam-20260630.xsd#RestructuringScheduleofRestructuringchargesDetails"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/RestructuringScheduleofRestructuringchargesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019e2319-be02-77c6-b11c-cceda57c4835" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e2319-be02-7557-8b96-ee61b093301d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019e2319-be02-77c6-b11c-cceda57c4835" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e2319-be02-7557-8b96-ee61b093301d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_019e2319-be02-76cf-be30-a0ad1a5ffea9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e2319-be02-7557-8b96-ee61b093301d" xlink:to="loc_us-gaap_RestructuringPlanAxis_019e2319-be02-76cf-be30-a0ad1a5ffea9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019e2319-be02-76cf-be30-a0ad1a5ffea9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_019e2319-be02-76cf-be30-a0ad1a5ffea9" xlink:to="loc_us-gaap_RestructuringPlanDomain_019e2319-be02-76cf-be30-a0ad1a5ffea9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019e2319-be02-75cf-a9b0-d910c86eda8e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_019e2319-be02-76cf-be30-a0ad1a5ffea9" xlink:to="loc_us-gaap_RestructuringPlanDomain_019e2319-be02-75cf-a9b0-d910c86eda8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_Q42025ActionPlanMember_019e2319-be02-73d7-b465-161841fe96ce" xlink:href="akam-20260630.xsd#akam_Q42025ActionPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_019e2319-be02-75cf-a9b0-d910c86eda8e" xlink:to="loc_akam_Q42025ActionPlanMember_019e2319-be02-73d7-b465-161841fe96ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_AcquisitionsRelatedAndOtherMember_019e2319-be02-7d0c-a59f-244494839a69" xlink:href="akam-20260630.xsd#akam_AcquisitionsRelatedAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_019e2319-be02-75cf-a9b0-d910c86eda8e" xlink:to="loc_akam_AcquisitionsRelatedAndOtherMember_019e2319-be02-7d0c-a59f-244494839a69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_019e2319-be02-780b-871d-cf2b4f98bfc0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019e2319-be02-77c6-b11c-cceda57c4835" xlink:to="loc_us-gaap_RestructuringCharges_019e2319-be02-780b-871d-cf2b4f98bfc0" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/RestructuringScheduleofChangesinLiabilityDetails" xlink:type="simple" xlink:href="akam-20260630.xsd#RestructuringScheduleofChangesinLiabilityDetails"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/RestructuringScheduleofChangesinLiabilityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019e2319-be02-7d44-85f4-470cae3d8ef9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e2319-be02-7026-b6af-a64bd900a7f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019e2319-be02-7d44-85f4-470cae3d8ef9" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e2319-be02-7026-b6af-a64bd900a7f0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_019e2319-be02-7705-a7f5-f14bcafd7534" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e2319-be02-7026-b6af-a64bd900a7f0" xlink:to="loc_us-gaap_RestructuringPlanAxis_019e2319-be02-7705-a7f5-f14bcafd7534" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019e2319-be02-7705-a7f5-f14bcafd7534_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_019e2319-be02-7705-a7f5-f14bcafd7534" xlink:to="loc_us-gaap_RestructuringPlanDomain_019e2319-be02-7705-a7f5-f14bcafd7534_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019e2319-be02-7a96-9ca5-c5cd9a6c35b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_019e2319-be02-7705-a7f5-f14bcafd7534" xlink:to="loc_us-gaap_RestructuringPlanDomain_019e2319-be02-7a96-9ca5-c5cd9a6c35b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_Q42025ActionPlanMember_019e2319-be02-74a8-a503-c8859c401244" xlink:href="akam-20260630.xsd#akam_Q42025ActionPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_019e2319-be02-7a96-9ca5-c5cd9a6c35b9" xlink:to="loc_akam_Q42025ActionPlanMember_019e2319-be02-74a8-a503-c8859c401244" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_AcquisitionsRelatedAndOtherMember_019e2319-be02-7ef9-b858-0be6c97bfee5" xlink:href="akam-20260630.xsd#akam_AcquisitionsRelatedAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_019e2319-be02-7a96-9ca5-c5cd9a6c35b9" xlink:to="loc_akam_AcquisitionsRelatedAndOtherMember_019e2319-be02-7ef9-b858-0be6c97bfee5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveRollForward_019e2319-be02-72ce-b5a9-dd68e77bbd24" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringReserveRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019e2319-be02-7d44-85f4-470cae3d8ef9" xlink:to="loc_us-gaap_RestructuringReserveRollForward_019e2319-be02-72ce-b5a9-dd68e77bbd24" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_019e2319-be02-7c27-99cc-4384e3a750d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_019e2319-be02-72ce-b5a9-dd68e77bbd24" xlink:to="loc_us-gaap_RestructuringReserve_019e2319-be02-7c27-99cc-4384e3a750d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveAccrualAdjustment1_019e2319-be02-74e0-af5d-1940e6d46621" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringReserveAccrualAdjustment1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_019e2319-be02-72ce-b5a9-dd68e77bbd24" xlink:to="loc_us-gaap_RestructuringReserveAccrualAdjustment1_019e2319-be02-74e0-af5d-1940e6d46621" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRestructuring_019e2319-be02-78b7-8789-33bec1f9e281" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForRestructuring"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_019e2319-be02-72ce-b5a9-dd68e77bbd24" xlink:to="loc_us-gaap_PaymentsForRestructuring_019e2319-be02-78b7-8789-33bec1f9e281" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveTranslationAndOtherAdjustment_019e2319-be02-776f-8e59-48e8cbaf3108" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringReserveTranslationAndOtherAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_019e2319-be02-72ce-b5a9-dd68e77bbd24" xlink:to="loc_us-gaap_RestructuringReserveTranslationAndOtherAdjustment_019e2319-be02-776f-8e59-48e8cbaf3108" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_019e2319-be02-7df6-bbcf-eb0525c6ca08" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringReserve"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/StockholdersEquityNarrativeDetails" xlink:type="simple" xlink:href="akam-20260630.xsd#StockholdersEquityNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/StockholdersEquityNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_019e2319-be02-7dbf-8235-d5bccb7a5e64" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_019e2319-be02-754e-9bd7-73491ab9b645" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_019e2319-be02-7dbf-8235-d5bccb7a5e64" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_019e2319-be02-754e-9bd7-73491ab9b645" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019e2319-be02-7b81-9018-4b10367ec9cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_019e2319-be02-754e-9bd7-73491ab9b645" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019e2319-be02-7b81-9018-4b10367ec9cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019e2319-be02-7b81-9018-4b10367ec9cd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019e2319-be02-7b81-9018-4b10367ec9cd" xlink:to="loc_us-gaap_ClassOfStockDomain_019e2319-be02-7b81-9018-4b10367ec9cd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019e2319-be02-7fbf-a4ac-6e63fddf42ad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019e2319-be02-7b81-9018-4b10367ec9cd" xlink:to="loc_us-gaap_ClassOfStockDomain_019e2319-be02-7fbf-a4ac-6e63fddf42ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019e2319-be02-7999-a7dd-9bcee0eee048" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019e2319-be02-7fbf-a4ac-6e63fddf42ad" xlink:to="loc_us-gaap_CommonStockMember_019e2319-be02-7999-a7dd-9bcee0eee048" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019e2319-be02-73c9-915f-aa3f1742adcc" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019e2319-be02-7dbf-8235-d5bccb7a5e64" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019e2319-be02-73c9-915f-aa3f1742adcc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_019e2319-be02-7620-b05e-2456304f759c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019e2319-be02-7dbf-8235-d5bccb7a5e64" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_019e2319-be02-7620-b05e-2456304f759c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_019e2319-be02-72c8-86fa-fb2173b960f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019e2319-be02-7dbf-8235-d5bccb7a5e64" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_019e2319-be02-72c8-86fa-fb2173b960f2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_019e2319-be02-776e-ae80-7fd7a98778ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019e2319-be02-7dbf-8235-d5bccb7a5e64" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_019e2319-be02-776e-ae80-7fd7a98778ff" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ShareBasedCompensationArrangementByShareBasedPaymentAwardAmortizationOfCapitalizedAmounts_019e2319-be02-7a91-841d-8165850a9b1f" xlink:href="akam-20260630.xsd#akam_ShareBasedCompensationArrangementByShareBasedPaymentAwardAmortizationOfCapitalizedAmounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019e2319-be02-7dbf-8235-d5bccb7a5e64" xlink:to="loc_akam_ShareBasedCompensationArrangementByShareBasedPaymentAwardAmortizationOfCapitalizedAmounts_019e2319-be02-7a91-841d-8165850a9b1f" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/StockholdersEquityScheduleofComponentsofTotalStockBasedCompensationDetails" xlink:type="simple" xlink:href="akam-20260630.xsd#StockholdersEquityScheduleofComponentsofTotalStockBasedCompensationDetails"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/StockholdersEquityScheduleofComponentsofTotalStockBasedCompensationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2319-be02-7f69-9d8c-30e2f13faf05" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2319-be02-72a0-9094-6344cf93ca80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2319-be02-7f69-9d8c-30e2f13faf05" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2319-be02-72a0-9094-6344cf93ca80" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019e2319-be02-7443-9355-f6ff57be0ebc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfIncomeLocationBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2319-be02-72a0-9094-6344cf93ca80" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019e2319-be02-7443-9355-f6ff57be0ebc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019e2319-be02-77ee-b003-03e06ea0e99c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2319-be02-7f69-9d8c-30e2f13faf05" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019e2319-be02-77ee-b003-03e06ea0e99c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_019e2319-be02-7fa2-838c-7b5fce4db5b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2319-be02-7f69-9d8c-30e2f13faf05" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_019e2319-be02-7fa2-838c-7b5fce4db5b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_019e2319-be02-7873-8de4-d01c3416e964" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2319-be02-7f69-9d8c-30e2f13faf05" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_019e2319-be02-7873-8de4-d01c3416e964" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/StockholdersEquityScheduleofComponentsofTotalStockBasedCompensationDetails_1" xlink:type="simple" xlink:href="akam-20260630.xsd#StockholdersEquityScheduleofComponentsofTotalStockBasedCompensationDetails_1"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/StockholdersEquityScheduleofComponentsofTotalStockBasedCompensationDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2319-be02-7f69-9d8c-30e2f13faf05" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2319-be02-72a0-9094-6344cf93ca80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2319-be02-7f69-9d8c-30e2f13faf05" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2319-be02-72a0-9094-6344cf93ca80" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019e2319-be02-77ee-b003-03e06ea0e99c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2319-be02-7f69-9d8c-30e2f13faf05" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019e2319-be02-77ee-b003-03e06ea0e99c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_019e2319-be02-7fa2-838c-7b5fce4db5b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2319-be02-7f69-9d8c-30e2f13faf05" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_019e2319-be02-7fa2-838c-7b5fce4db5b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_019e2319-be02-7873-8de4-d01c3416e964" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2319-be02-7f69-9d8c-30e2f13faf05" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_019e2319-be02-7873-8de4-d01c3416e964" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/AccumulatedOtherComprehensiveLossDetails" xlink:type="simple" xlink:href="akam-20260630.xsd#AccumulatedOtherComprehensiveLossDetails"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/AccumulatedOtherComprehensiveLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019e2319-be02-7a5f-9558-9c513bf2892e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019e2319-be02-7247-be61-aacb9eb32a71" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019e2319-be02-7a5f-9558-9c513bf2892e" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019e2319-be02-7247-be61-aacb9eb32a71" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019e2319-be02-782e-a0c0-7b236cac1bed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019e2319-be02-7247-be61-aacb9eb32a71" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019e2319-be02-782e-a0c0-7b236cac1bed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e2319-be02-782e-a0c0-7b236cac1bed_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e2319-be02-782e-a0c0-7b236cac1bed" xlink:to="loc_us-gaap_EquityComponentDomain_019e2319-be02-782e-a0c0-7b236cac1bed_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e2319-be02-70d4-bb09-e446c5382b80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e2319-be02-782e-a0c0-7b236cac1bed" xlink:to="loc_us-gaap_EquityComponentDomain_019e2319-be02-70d4-bb09-e446c5382b80" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e2319-be02-79dc-a0f5-65aed506315b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e2319-be02-70d4-bb09-e446c5382b80" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e2319-be02-79dc-a0f5-65aed506315b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019e2319-be02-7ef4-a519-efa243a06ccd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e2319-be02-79dc-a0f5-65aed506315b" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019e2319-be02-7ef4-a519-efa243a06ccd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_019e2319-be02-703a-b4a0-8e06daa0a661" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e2319-be02-79dc-a0f5-65aed506315b" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_019e2319-be02-703a-b4a0-8e06daa0a661" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_019e2319-be02-749a-86c1-7cfe7154d242" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AOCIAttributableToParentNetOfTaxRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019e2319-be02-7a5f-9558-9c513bf2892e" xlink:to="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_019e2319-be02-749a-86c1-7cfe7154d242" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e2319-be02-75f5-b5ba-e1afe0e43857" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_019e2319-be02-749a-86c1-7cfe7154d242" xlink:to="loc_us-gaap_StockholdersEquity_019e2319-be02-75f5-b5ba-e1afe0e43857" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019e2319-be02-7d6e-a211-d34d99f64152" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_019e2319-be02-749a-86c1-7cfe7154d242" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019e2319-be02-7d6e-a211-d34d99f64152" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e2319-be02-7c0e-a657-ca3213c2a8f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/RevenuefromContractswithCustomersScheduleofRevenuebyGeographicalandSolutionCategoryDetails" xlink:type="simple" xlink:href="akam-20260630.xsd#RevenuefromContractswithCustomersScheduleofRevenuebyGeographicalandSolutionCategoryDetails"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/RevenuefromContractswithCustomersScheduleofRevenuebyGeographicalandSolutionCategoryDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019e2319-be02-7002-a042-80eeff03352a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019e2319-be02-776d-b4b6-0599acd42813" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e2319-be02-7002-a042-80eeff03352a" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019e2319-be02-776d-b4b6-0599acd42813" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019e2319-be02-74a1-bf1b-00869fe13f38" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e2319-be02-776d-b4b6-0599acd42813" xlink:to="loc_srt_StatementGeographicalAxis_019e2319-be02-74a1-bf1b-00869fe13f38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019e2319-be02-74a1-bf1b-00869fe13f38_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019e2319-be02-74a1-bf1b-00869fe13f38" xlink:to="loc_srt_SegmentGeographicalDomain_019e2319-be02-74a1-bf1b-00869fe13f38_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019e2319-be02-7e66-913b-c667350753fc" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019e2319-be02-74a1-bf1b-00869fe13f38" xlink:to="loc_srt_SegmentGeographicalDomain_019e2319-be02-7e66-913b-c667350753fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019e2319-be02-7e68-b9d1-24443b8ca7fd" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019e2319-be02-7e66-913b-c667350753fc" xlink:to="loc_country_US_019e2319-be02-7e68-b9d1-24443b8ca7fd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonUsMember_019e2319-be02-7dd0-8a66-85e49146ac3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019e2319-be02-7e66-913b-c667350753fc" xlink:to="loc_us-gaap_NonUsMember_019e2319-be02-7dd0-8a66-85e49146ac3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelAxis_019e2319-be02-7429-b206-7132bc585553" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerSalesChannelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e2319-be02-776d-b4b6-0599acd42813" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelAxis_019e2319-be02-7429-b206-7132bc585553" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelDomain_019e2319-be02-7429-b206-7132bc585553_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerSalesChannelDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelAxis_019e2319-be02-7429-b206-7132bc585553" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelDomain_019e2319-be02-7429-b206-7132bc585553_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelDomain_019e2319-be02-76de-bf74-11f7706fbb12" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerSalesChannelDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelAxis_019e2319-be02-7429-b206-7132bc585553" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelDomain_019e2319-be02-76de-bf74-11f7706fbb12" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_SecurityMember_019e2319-be02-79ca-b4d7-ac771d71813f" xlink:href="akam-20260630.xsd#akam_SecurityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelDomain_019e2319-be02-76de-bf74-11f7706fbb12" xlink:to="loc_akam_SecurityMember_019e2319-be02-79ca-b4d7-ac771d71813f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_DeliveryAndOtherCloudApplicationsMember_019e2319-be02-79f5-ab82-784f359cb9cb" xlink:href="akam-20260630.xsd#akam_DeliveryAndOtherCloudApplicationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelDomain_019e2319-be02-76de-bf74-11f7706fbb12" xlink:to="loc_akam_DeliveryAndOtherCloudApplicationsMember_019e2319-be02-79f5-ab82-784f359cb9cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_CloudInfrastructureServicesMember_019e2319-be02-7e22-8ebc-0eaee85c8af6" xlink:href="akam-20260630.xsd#akam_CloudInfrastructureServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelDomain_019e2319-be02-76de-bf74-11f7706fbb12" xlink:to="loc_akam_CloudInfrastructureServicesMember_019e2319-be02-7e22-8ebc-0eaee85c8af6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_019e2319-be02-7f24-97b1-757a48708624" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e2319-be02-7002-a042-80eeff03352a" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_019e2319-be02-7f24-97b1-757a48708624" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/RevenuefromContractswithCustomersPerformanceObligationsNarrativeDetails" xlink:type="simple" xlink:href="akam-20260630.xsd#RevenuefromContractswithCustomersPerformanceObligationsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/RevenuefromContractswithCustomersPerformanceObligationsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e2319-be02-7791-9fef-8f3477728440" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e2319-be02-7e81-9a8f-b8bbb116ea16" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e2319-be02-7791-9fef-8f3477728440" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e2319-be02-7e81-9a8f-b8bbb116ea16" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019e2319-be02-7182-9b0e-5fb3d7c5f9ce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e2319-be02-7e81-9a8f-b8bbb116ea16" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019e2319-be02-7182-9b0e-5fb3d7c5f9ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019e2319-be02-7cb7-9f6e-cb96b3ec2096" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e2319-be02-7791-9fef-8f3477728440" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019e2319-be02-7cb7-9f6e-cb96b3ec2096" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019e2319-be02-783f-9bd6-e5108fa35ebc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e2319-be02-7791-9fef-8f3477728440" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019e2319-be02-783f-9bd6-e5108fa35ebc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e2319-be02-7153-b442-8f3b43c00a6d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e2319-be02-7791-9fef-8f3477728440" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e2319-be02-7153-b442-8f3b43c00a6d" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/RevenuefromContractswithCustomersPerformanceObligationsNarrativeDetails_1" xlink:type="simple" xlink:href="akam-20260630.xsd#RevenuefromContractswithCustomersPerformanceObligationsNarrativeDetails_1"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/RevenuefromContractswithCustomersPerformanceObligationsNarrativeDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e2319-be02-7791-9fef-8f3477728440" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e2319-be02-7e81-9a8f-b8bbb116ea16" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e2319-be02-7791-9fef-8f3477728440" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e2319-be02-7e81-9a8f-b8bbb116ea16" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019e2319-be02-7cb7-9f6e-cb96b3ec2096" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e2319-be02-7791-9fef-8f3477728440" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019e2319-be02-7cb7-9f6e-cb96b3ec2096" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019e2319-be02-783f-9bd6-e5108fa35ebc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e2319-be02-7791-9fef-8f3477728440" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019e2319-be02-783f-9bd6-e5108fa35ebc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e2319-be02-7153-b442-8f3b43c00a6d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e2319-be02-7791-9fef-8f3477728440" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e2319-be02-7153-b442-8f3b43c00a6d" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/NetIncomeperShareScheduleofAntidilutiveSecuritiesExcludedfromComputationofEarningsPerShareDetails" xlink:type="simple" xlink:href="akam-20260630.xsd#NetIncomeperShareScheduleofAntidilutiveSecuritiesExcludedfromComputationofEarningsPerShareDetails"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/NetIncomeperShareScheduleofAntidilutiveSecuritiesExcludedfromComputationofEarningsPerShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e2319-be02-7a63-b2ca-f38946c3f80c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019e2319-be02-7142-b340-82da83f7315d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e2319-be02-7a63-b2ca-f38946c3f80c" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019e2319-be02-7142-b340-82da83f7315d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e2319-be02-759d-b2e2-a83b1504cd16" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019e2319-be02-7142-b340-82da83f7315d" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e2319-be02-759d-b2e2-a83b1504cd16" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2319-be02-759d-b2e2-a83b1504cd16_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e2319-be02-759d-b2e2-a83b1504cd16" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2319-be02-759d-b2e2-a83b1504cd16_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2319-be02-75aa-9200-432a975dffe4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e2319-be02-759d-b2e2-a83b1504cd16" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2319-be02-75aa-9200-432a975dffe4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_RestrictedStockAwardsRestrictedStockUnitsAndDeferredStockUnitsServiceBasedMember_019e2319-be02-7e2d-ba0d-5119010322a3" xlink:href="akam-20260630.xsd#akam_RestrictedStockAwardsRestrictedStockUnitsAndDeferredStockUnitsServiceBasedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2319-be02-75aa-9200-432a975dffe4" xlink:to="loc_akam_RestrictedStockAwardsRestrictedStockUnitsAndDeferredStockUnitsServiceBasedMember_019e2319-be02-7e2d-ba0d-5119010322a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_RestrictedStockRestrictedStockUnitsAndDeferredStockUnitsPerformanceBasedMember_019e2319-be02-7fe7-9ae9-103e1fefbc6e" xlink:href="akam-20260630.xsd#akam_RestrictedStockRestrictedStockUnitsAndDeferredStockUnitsPerformanceBasedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2319-be02-75aa-9200-432a975dffe4" xlink:to="loc_akam_RestrictedStockRestrictedStockUnitsAndDeferredStockUnitsPerformanceBasedMember_019e2319-be02-7fe7-9ae9-103e1fefbc6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertiblesAndBondsWithWarrantsAttachedMember_019e2319-be02-75ed-a690-1ccb0306df31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConvertiblesAndBondsWithWarrantsAttachedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2319-be02-75aa-9200-432a975dffe4" xlink:to="loc_us-gaap_ConvertiblesAndBondsWithWarrantsAttachedMember_019e2319-be02-75ed-a690-1ccb0306df31" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019e2319-be02-7ccf-a124-7b79d8cc90dc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e2319-be02-7a63-b2ca-f38946c3f80c" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019e2319-be02-7ccf-a124-7b79d8cc90dc" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.akamai.com/role/SegmentInformationScheduleofInformationRegardingOperatingSegmentDetails" xlink:type="simple" xlink:href="akam-20260630.xsd#SegmentInformationScheduleofInformationRegardingOperatingSegmentDetails"/>
  <link:definitionLink xlink:role="http://www.akamai.com/role/SegmentInformationScheduleofInformationRegardingOperatingSegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019e2319-be02-7c8b-9cf1-712b64abe766" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e2319-be02-73a5-91ca-a9b4a8da89cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2319-be02-7c8b-9cf1-712b64abe766" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e2319-be02-73a5-91ca-a9b4a8da89cf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e2319-be02-7ea0-b567-d74419f1ab22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e2319-be02-73a5-91ca-a9b4a8da89cf" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e2319-be02-7ea0-b567-d74419f1ab22" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e2319-be02-7ea0-b567-d74419f1ab22_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e2319-be02-7ea0-b567-d74419f1ab22" xlink:to="loc_us-gaap_SegmentDomain_019e2319-be02-7ea0-b567-d74419f1ab22_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e2319-be02-71cb-bd13-4e3a49c06940" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e2319-be02-7ea0-b567-d74419f1ab22" xlink:to="loc_us-gaap_SegmentDomain_019e2319-be02-71cb-bd13-4e3a49c06940" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ReportableSegmentMember_019e2319-be02-7744-af7f-353c37166140" xlink:href="akam-20260630.xsd#akam_ReportableSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e2319-be02-71cb-bd13-4e3a49c06940" xlink:to="loc_akam_ReportableSegmentMember_019e2319-be02-7744-af7f-353c37166140" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfOperatingSegments_019e2319-be02-7e7e-a6a3-f210a5791f66" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NumberOfOperatingSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2319-be02-7c8b-9cf1-712b64abe766" xlink:to="loc_us-gaap_NumberOfOperatingSegments_019e2319-be02-7e7e-a6a3-f210a5791f66" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_019e2319-be02-75b9-9b2f-402fd4f9d54d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2319-be02-7c8b-9cf1-712b64abe766" xlink:to="loc_us-gaap_NumberOfReportableSegments_019e2319-be02-75b9-9b2f-402fd4f9d54d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_019e2319-be02-71ac-82a6-ac81ce1a311a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2319-be02-7c8b-9cf1-712b64abe766" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_019e2319-be02-71ac-82a6-ac81ce1a311a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_CoLocationFees_019e2319-be02-71fb-be5a-8ca9bffdbbe7" xlink:href="akam-20260630.xsd#akam_CoLocationFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2319-be02-7c8b-9cf1-712b64abe766" xlink:to="loc_akam_CoLocationFees_019e2319-be02-71fb-be5a-8ca9bffdbbe7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_BandwidthFees_019e2319-be02-7ffb-9069-2e2256d14613" xlink:href="akam-20260630.xsd#akam_BandwidthFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2319-be02-7c8b-9cf1-712b64abe766" xlink:to="loc_akam_BandwidthFees_019e2319-be02-7ffb-9069-2e2256d14613" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfessionalAndContractServicesExpense_019e2319-be02-7822-a98b-9a5d39083521" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfessionalAndContractServicesExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2319-be02-7c8b-9cf1-712b64abe766" xlink:to="loc_us-gaap_ProfessionalAndContractServicesExpense_019e2319-be02-7822-a98b-9a5d39083521" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_019e2319-be02-7ac9-96d0-f950ccdea3a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2319-be02-7c8b-9cf1-712b64abe766" xlink:to="loc_us-gaap_LaborAndRelatedExpense_019e2319-be02-7ac9-96d0-f950ccdea3a5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_CapitalizedSalariesAndRelatedCosts_019e2319-be02-7559-bb8c-15d10c720f2f" xlink:href="akam-20260630.xsd#akam_CapitalizedSalariesAndRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2319-be02-7c8b-9cf1-712b64abe766" xlink:to="loc_akam_CapitalizedSalariesAndRelatedCosts_019e2319-be02-7559-bb8c-15d10c720f2f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_FacilitiesRelatedCosts_019e2319-be02-75ea-aa47-ef9bed010ad6" xlink:href="akam-20260630.xsd#akam_FacilitiesRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2319-be02-7c8b-9cf1-712b64abe766" xlink:to="loc_akam_FacilitiesRelatedCosts_019e2319-be02-75ea-aa47-ef9bed010ad6" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_SoftwareAndRelatedServices_019e2319-be02-7fc3-bb95-bff85e3d4a09" xlink:href="akam-20260630.xsd#akam_SoftwareAndRelatedServices"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2319-be02-7c8b-9cf1-712b64abe766" xlink:to="loc_akam_SoftwareAndRelatedServices_019e2319-be02-7fc3-bb95-bff85e3d4a09" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingOtherItemAmount_019e2319-be02-7915-ad60-ec90b93e0c20" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingOtherItemAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2319-be02-7c8b-9cf1-712b64abe766" xlink:to="loc_us-gaap_SegmentReportingOtherItemAmount_019e2319-be02-7915-ad60-ec90b93e0c20" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_019e2319-be02-721a-b019-ae012239a585" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2319-be02-7c8b-9cf1-712b64abe766" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_019e2319-be02-721a-b019-ae012239a585" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019e2319-be02-7823-ab29-c06ef8fde503" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2319-be02-7c8b-9cf1-712b64abe766" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019e2319-be02-7823-ab29-c06ef8fde503" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostIncurredCost_019e2319-be02-7d3b-b941-ebf031ca532a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringAndRelatedCostIncurredCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2319-be02-7c8b-9cf1-712b64abe766" xlink:to="loc_us-gaap_RestructuringAndRelatedCostIncurredCost_019e2319-be02-7d3b-b941-ebf031ca532a" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_AcquisitionRelatedBenefitCosts_019e2319-be02-75e8-8587-1a968bcf42e4" xlink:href="akam-20260630.xsd#akam_AcquisitionRelatedBenefitCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2319-be02-7c8b-9cf1-712b64abe766" xlink:to="loc_akam_AcquisitionRelatedBenefitCosts_019e2319-be02-75e8-8587-1a968bcf42e4" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_InterestAndMarketableSecuritiesIncomeLossNet_019e2319-be02-7745-8bb9-bd3db6324a8a" xlink:href="akam-20260630.xsd#akam_InterestAndMarketableSecuritiesIncomeLossNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2319-be02-7c8b-9cf1-712b64abe766" xlink:to="loc_akam_InterestAndMarketableSecuritiesIncomeLossNet_019e2319-be02-7745-8bb9-bd3db6324a8a" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_019e2319-be02-72ef-bc27-151180f43779" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2319-be02-7c8b-9cf1-712b64abe766" xlink:to="loc_us-gaap_InterestExpenseNonoperating_019e2319-be02-72ef-bc27-151180f43779" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_019e2319-be02-7066-a66b-84aec2d50b5e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2319-be02-7c8b-9cf1-712b64abe766" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_019e2319-be02-7066-a66b-84aec2d50b5e" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019e2319-be02-7fdf-852b-fc3febe96cab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2319-be02-7c8b-9cf1-712b64abe766" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019e2319-be02-7fdf-852b-fc3febe96cab" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e2319-be02-71f9-af2e-4ba5bdd0c987" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2319-be02-7c8b-9cf1-712b64abe766" xlink:to="loc_us-gaap_NetIncomeLoss_019e2319-be02-71f9-af2e-4ba5bdd0c987" xlink:type="arc" order="19"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#IndividualsOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllIndividualsMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AllIndividualsMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_akam_ManiSundaramMember_019e2319-bc82-7b32-ba8d-2d7df883907d" xlink:href="akam-20260630.xsd#akam_ManiSundaramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_akam_ManiSundaramMember_019e2319-bc82-7b32-ba8d-2d7df883907d" xlink:type="arc" order="2"/>
  </link:definitionLink>
</link:linkbase>
