an·to·nym

[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

Related forms
an·ton·y·mous [an-ton-uh-muhs] , an·to·nym·ic, adjective
an·ton·y·my, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
antonym (ˈæntənɪm) [Click for IPA pronunciation guide]
 
—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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Antonym is always a great word to know.
So is lollapalooza. Does it mean:
a gadget; dingus; thingumbob.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
LEARN MORE UNUSUAL WORDS WITH WORD DYNAMO...
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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Example sentences
The furnishings inside were an antonym for plush.
Opposites are also referred to as antonyms.
Tasteless is the antonym of both tasteful and tasty: The tasteless furnishings.
Thus, under goodness they refer to badness as an antonym.
Related Words
opposite
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