Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A word having a meaning opposite to that of another word.

from The Century Dictionary.

  • noun A counterterm; an opposite; an antithetical word: the opposite of synonym: as, life is the antonym of death.

from the GNU version of the Collaborative International Dictionary of English.

  • noun rare A word of opposite meaning; a counterterm; -- used as a correlative of synonym.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun semantics A word which has the opposite meaning of another, although not necessarily in all its senses.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a word that expresses a meaning opposed to the meaning of another word, in which case the two words are antonyms of each other

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[ant(i)– + –onym.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

circa 1870: ant- + -onym

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