noun, plural adversaries.
a person, group, or force that opposes or attacks; opponent; enemy; foe.
a person, group, etc., that is an opponent in a contest; contestant.
the Adversary, the devil; Satan.
adjective Also, especially British, adversarial [ad-ver-sair-ee-uhl] .
of or pertaining to an adversary.
involving adversaries, as plaintiff and defendant in a legal proceeding: an adversary trial.

1300–50; Middle English adversarie < Latin adversārius, equivalent to advers(us) (see adverse) + -ārius -ary; replacing Middle English adversere < Anglo-French

adversariness, noun
nonadversarial, adjective

1. Adversary, antagonist mean a person or a group contending against another. Adversary suggests an enemy who fights determinedly, continuously, and relentlessly: a formidable adversary. Antagonist suggests one who, in hostile spirit, opposes another, often in a particular contest or struggle: a duel with an antagonist.

1. ally. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
adversary (ˈædvəsərɪ)
n , pl -saries
1.  a person or group that is hostile to someone; enemy
2.  an opposing contestant in a game or sport
3.  the US term for adversarial
[C14: from Latin adversārius, from adversus against. See adverse]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 14c., aduersere, from Anglo-Fr. adverser (13c.), from O.Fr. adversier, from L. adversarius "opponent, adversary, rival," lit. "turned toward one," from adversus "turned against" (see adverse). The L. word is glossed in O.E. by wiðerbroca. The adj. adversarial is
attested from 1970 and probably was coined to avoid confusion which might arise with use of adversary (adj.), which is attested from late 14c.
Online Etymology Dictionary, © 2010 Douglas Harper
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Bible Dictionary

Adversary definition

(Heb. satan), an opponent or foe (1 Kings 5:4; 11:14, 23, 25; Luke 13:17); one that speaks against another, a complainant (Matt. 5:25; Luke 12:58); an enemy (Luke 18:3), and specially the devil (1 Pet. 5:8).

Easton's 1897 Bible Dictionary
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Example sentences
Only by correctly understanding the nature of the adversaries who launched.
For the world, it seemed a token of peace between two nuclear-armed adversaries.
The swashbuckling birds sometimes team up to overwhelm their victims, and they
  are relentless in chasing down their adversaries.
Preventing the spread of war will depend on strategies that recognize the
  shared interests of adversaries.
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