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

an·ton·y·mous [an-ton-uh-muhs] , an·to·nym·ic, adjective
an·ton·y·my, noun
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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
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00:10
Antonym is always a great word to know.
So is flibbertigibbet. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a chattering or flighty, light-headed person.
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 antonym of design is not evolution, the antonyms of design are accident and
  coincidence.
The term anesthetic is an antonym of aesthetic.
Though considered jargon by some, it's a useful antonym to reactive.
The furnishings inside were an antonym for plush.
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