[See quot.] A term that is the opposite or antithesis of another, a counter-term.
1870. C. J. Smith, Syn. & Antonyms, Pref. 6. The Etymology of the word ἀντωνυμία merely expresses the idea of one word in substitution for, which in matters of verbal debate, is equivalent practically to opposition to another; a double force which, in addition to its analogy to Synonym, seemed to render Antonym a preferable word to Counterterm.
1881. Nation, No. 835, 464/1. The inevitable difficulty of choosing among synonyms and antonyms is rendered of little account by a liberal supply of cross-references.
