Etymology
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antonym (n.)

"an antithetical word," 1867, coined to serve as opposite of synonym, from Greek anti "opposite, against" (see anti-) + onym "name" (from PIE root *no-men- "name"). Perhaps introduced to English in the book "Synonyms and Antonyms" (1867) by the Ven. C.J. Smith, M.A.

UNDER the head of Synonyms and Antonyms, Archdeacon Smith arranges words which form an antithesis to one another. The word "antonym" is, we believe, a new formation but useful. [Journal of Sacred Literature, July 1867]

French antonyme (1842), German antonym (by 1859) are older. The un-Greek alternative counterterm has been left to fade.

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Definitions of antonym

antonym (n.)
a word that expresses a meaning opposed to the meaning of another word, in which case the two words are antonyms of each other;
to him the antonym of `gay' was `depressed'
Synonyms: opposite word / opposite
From wordnet.princeton.edu