DICT.TW Dictionary Taiwan

 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