verb (used with or without object), a·mel·io·rat·ed, a·mel·io·rat·ing.
- to make or become better, more bearable, or more satisfactory; improve: strategies to ameliorate negative effects on the environment.
- to make or become better; improve
1728, perhaps a back-formation from amelioration on pattern of French améliorer. The simpler form meliorate was used in Middle English. Related: Ameliorated; ameliorating.