a word opposite in meaning to another. Fast is an antonym of slow. Compare synonym ( def 1 ).

1865–70; ant- + (syn)onym

antonymous [an-ton-uh-muhs] , antonymic, adjective
antonymy, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
antonym (ˈæntənɪm)
a word that means the opposite of another word: ``empty'' is an antonym of ``full''
[C19: from Greek antōnumia, from anti- + onoma name]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

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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American Heritage
Cultural Dictionary
antonyms [(an-tuh-nimz)]

Two words with opposite meanings. Cold and hot are antonyms; so are small and large. (Compare synonyms.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The two are so tightly coupled that they are practically antonyms.
But still--"immigrant" and "citizen" are not antonyms.
Meanwhile, they will be receiving a thorough review of word pairs and antonyms.
Antithesis and alter ego are functionally antonyms.
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