melioration
改善
Mel·io·ra·tion n. The act or operation of meliorating, or the state of being meliorated; improvement.
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melioration
n 1: the act of relieving ills and changing for the better [syn:
amelioration, betterment]
2: a condition superior to an earlier condition; "the new
school represents a great improvement" [syn: improvement]
[ant: decline]
3: the linguistic process in which over a period of time a word
grows more positive in connotation or more elevated in
meaning