1. the action of reducing the severity, seriousness, or painfulness of something:"the emphasis is on the identification and mitigation of pollution"SimilaralleviationreductiondiminutionlesseningeasingweakeninglighteningassuagementpalliationcushioningdullingdeadeningsoothingsofteningreliefOppositeintensification
Word Originlate Middle English: from Old French, or from Latin mitigatio(n-), from the verb mitigare ‘alleviate’ (see mitigate).