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1. One that opposes another or others, as in a battle, contest, or debate: a political opponent.
2. One who is hostile to an idea or cause: an opponent of gun control.
Acting against an antagonist or opposing force: opponent armies.

[Latin oppōnēns, oppōnent-, present participle of oppōnere, to oppose; see oppose.]

op·po′nen·cy n.


1. the state or quality of being an opponent.
2. an act or instance of opposing.
See also: Conflict
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References in periodicals archive ?
Democracy and cultural diversity are the two coordinates that had a decisive role in the opponency of the nation state to the supranational governing.
Opponency is maintained in the visual pathway but spatial organisation changes at different levels.
The color hexagon: a chromaticity diagram based on photoreceptor excitations as a generalized representation of color opponency.