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antonym

[an-tuh-nim]
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noun
  1. a word opposite in meaning to another. Fast is an antonym of slow.Compare synonym(def 1).
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Origin of antonym

First recorded in 1865–70; ant- + (syn)onym
Related formsan·ton·y·mous [an-ton-uh-muh s] /ænˈtɒn ə məs/, an·to·nym·ic, adjectivean·ton·y·my, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for antonymic

antonym

noun
  1. a word that means the opposite of another word``empty'' is an antonym of ``full''
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Derived Formsantonymous (ænˈtɒnɪməs), adjective

Word Origin

C19: from Greek antōnumia, from anti- + onoma name
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for antonymic

antonym

n.

1867, coined to serve as opposite of synonym, from Greek anti- "equal to, instead of, opposite" (see anti-) + -onym "name" (see name (n.)). 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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Online Etymology Dictionary, © 2010 Douglas Harper