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WordNet (r) 3.0 (2006) (WordNet)

melioration
n 1: the act of relieving ills and changing for the better [synonym:
{amelioration}, {melioration}, {betterment}]
2: a condition superior to an earlier condition; "the new school
represents a great improvement" [synonym: {improvement},
{melioration}] [ant: {declination}, {decline}]
3: the linguistic process in which over a period of time a word
grows more positive in connotation or more elevated in
meaning