[meel-yuh-rey-shuh n, mee-lee-uh-] /ˌmil yəˈreɪ ʃən, ˌmi li ə-/

Historical Linguistics. semantic change in a word to a more approved or more respectable meaning.
Compare (def 2).
the act or an instance of improving or the state of being improved

c.1400, “improvement,” from Late Latin meliorationem (nominative melioratio), noun of action from past participle stem of Latin meliorare (see meliorate).


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