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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 ?
Opponency is maintained in the visual pathway but spatial organisation changes at different levels.
The reason for this is unclear but could be based upon cone opponency which is known to sharpen spectral sensitivity functions.
The signals of the cells are summed to form cone opponency during the second stage.