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meliorate (v.)
1550s, "to make better, improve" (transitive), a back-formation from melioration or else from Late Latin melioratus, past participle of meliorare "improve," from Latin melior "better," used as comparative of bonus "good," but probably originally meaning "stronger," from PIE root *mel- (2) "strong, great." Intransitive sense of "to grow better, be improved" is from 1650s. Related: Meliorated; meliorating; meliorative.
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Definitions of meliorate from WordNet
Dictionary entries near meliorate
Melchizedek
meld
*mele-
melee
*melg-
meliorate
melioration
meliorism
melisma
Melissa
*melit-