In this manner soils are constantly changing upon the same spot; sometimes they are meliorated, at other times impoverished.
Black and White will be most altered, while Green and Yellow will be meliorated.
Civilization has not meliorated mankind essentially while men hold themselves to services they make menial and degrading.
That something the manure of birds, meliorated and altered by time, had supplied, and lo!
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- "strong, great, numerous" (see multi-). Related: Meliorated; meliorating; melioration; meliorative.