ameliorate v. + Add to list US //əˈmiɫjɝˌeɪt// UK //ɐmˈiːliəɹˌeɪt// ame·lio·rate SynonymsAntonymsEtymology Synonyms amendbetterimprovemeliorate Antonyms worsenOriginFRAaméliorer→ENameliorate Alteration of meliorate after French améliorer.