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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
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for antonymous

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 antonymous

antonym

n.

1867, coined to serve as opposite of synonym, from Greek anti- "equal to, instead of, opposite" (see anti-) + -onym "name" (see name (n.)). Perhaps introduced to English in the book "Synonyms and Antonyms" (1867) by the Ven. C.J. Smith, M.A.

UNDER the head of Synonyms and Antonyms, Archdeacon Smith arranges words which form an antithesis to one another. The word "antonym" is, we believe, a new formation but useful. ["Journal of Sacred Literature," July 1867]
French antonyme (1842), German antonym (by 1859) are older. The un-Greek alternative counterterm has been left to fade.

Online Etymology Dictionary, © 2010 Douglas Harper
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