melioration

(mēl′yə rās̸hən)

noun

  1. a meliorating or being meliorated; improvement
  2. Linguis. the process by which the meaning or connotation of a word becomes more positive

See melioration in American Heritage Dictionary 4

noun
  1. a. The act or process of improving something or the state of being improved.
    b. An improvement.
  2. The linguistic process by which a word over a period of time grows more elevated in meaning or more positive in connotation.

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