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opponent

[uh-poh-nuh nt] /əˈpoʊ nənt/
noun
1.
a person who is on an opposing side in a game, contest, controversy, or the like; adversary.
adjective
2.
being opposite, as in position.
3.
opposing; adverse; antagonistic.
4.
Anatomy. bringing parts together or into opposition, as a muscle.
Origin of opponent
1580-1590
1580-90; < Latin oppōnent- (stem of oppōnēns, present participle of oppōnere to place over, against, or in front of, make an obstacle), equivalent to op- op- + pōn(ere) to place, set, put + -ent- -ent
Synonyms
1. antagonist. Opponent, competitor, rival refer to persons engaged in a contest. Opponent is the most impersonal, meaning merely one who opposes; perhaps one who continually blocks and frustrates or one who happens to be on the opposite side in a temporary contest: an opponent in a debate. Competitor emphasizes the action in striving against another, or others, for a definite, common goal: competitors in business. Rival has both personal and emotional connotations; it emphasizes the idea that (usually) two persons are struggling to attain the same object: rivals for an office.
Antonyms
1. ally, friend.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for opponent

opponent

/əˈpəʊnənt/
noun
1.
a person who opposes another in a contest, battle, etc
2.
(anatomy) an opponent muscle
adjective
3.
opposite, as in position
4.
(anatomy) (of a muscle) bringing two parts into opposition
5.
opposing; contrary
Derived Forms
opponency, noun
Word Origin
C16: from Latin oppōnere to oppose, from ob- against + pōnere to place
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for opponent
n.

1580s, from Latin opponentem (nominative opponens), present participle of opponere "oppose, object to," literally "set against, set opposite," from ob "against" (see ob-) + ponere "to put, set, place" (see position).

Online Etymology Dictionary, © 2010 Douglas Harper
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12
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