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antonym

[an-tuh-nim] /ˈæn tə nɪm/
noun
1.
a word opposite in meaning to another. Fast is an antonym of slow.
Compare synonym (def 1).
Origin
1865-1870
1865-70; ant- + (syn)onym
Related forms
antonymous
[an-ton-uh-muh s] /ænˈtɒn ə məs/ (Show IPA),
antonymic, adjective
antonymy, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for antonymic

antonym

/ˈæntənɪm/
noun
1.
a word that means the opposite of another word ``empty'' is an antonym of ``full''
Derived Forms
antonymous (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
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Word Origin and History for antonymic
antonym
1870, created to serve as opposite of synonym, from Gk. anti- "equal to, instead of, opposite" (see anti-) + -onym "name" (see name).
Online Etymology Dictionary, © 2010 Douglas Harper
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