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antonym

 - 3 dictionary results

an⋅to⋅nym

  [an-tuh-nim]
–noun
a word opposite in meaning to another. Fast is an antonym of slow. Compare synonym (def. 1).
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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. 2010.
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an·to·nym   (ān'tə-nĭm')   
n.  A word having a meaning opposite to that of another word: The word wet is an antonym of the word dry.

[ant(i)- + -onym.]
an'to·nym'ic adj., an·ton'y·mous (ān-tŏn'ə-məs) adj., an·ton'y·my n.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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, © 2001 Douglas Harper
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