antonym

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

Origin:
1865–70; ant- + (syn)onym

antonymous [an-ton-uh-muhs] , antonymic, adjective
antonymy, noun
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World English Dictionary
antonym (ˈæntənɪm)
 
n
a word that means the opposite of another word: ``empty'' is an antonym of ``full''
 
[C19: from Greek antōnumia, from anti- + onoma name]
 
antonymous
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

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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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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