melioration

mel·io·ra·tion

[meel-yuh-rey-shuhn, mee-lee-uh-]
noun
1.
Historical Linguistics. semantic change in a word to a more approved or more respectable meaning. Compare pejoration ( def 2 ).

Origin:
1620–30; < Late Latin meliōrātiōn- (stem of meliōrātiō), equivalent to meliōrāt(us) (see meliorate) + -iōn- -ion

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World English Dictionary
melioration (ˌmiːlɪəˈreɪʃən) [Click for IPA pronunciation guide]
 
n
the act or an instance of improving or the state of being improved

Collins English Dictionary - Complete & Unabridged 10th Edition
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Melioration is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
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