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meliorate (v.)

1550s, "to make better," back-formation from melioration or else from Late Latin melioratus, past participle of Latin meliorare "improve," from melior "better," used as comparative of bonus "good," but probably originally meaning "stronger," from PIE root *mel- (2) "strong, great." Related: Meliorated; meliorating; melioration; meliorative.