ameliorate (v.) Look up ameliorate at Dictionary.com
1728, "to make better," in some cases perhaps a back-formation from amelioration on pattern of French améliorer, or else from Medieval Latin amelioratus, past participle of ameliorare. Intransitive sense "grow better" is from 1789. The simpler form meliorate was used in Middle English. Related: Ameliorated; ameliorating; ameliorable.