3 definitions found From WordNet (r) 2.0 [wn]: opposer noun: someone who offers opposition [syn: {adversary}, {antagonist}, {opponent}, {resister}] [ant: {agonist}] From The Collaborative International Dictionary of English v.0.44 [gcide]: opposer \op*pos"er\ ([o^]p*p[=o]z"[~e]r), noun One who opposes; an opponent; an antagonist; an adversary. From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]: 30 Moby Thesaurus words for "opposer": adversary, antagonist, anti, bitter-ender, brawler, con, defendant, diehard, disputant, dissentient, dissident, intransigent, irreconcilable, last-ditcher, litigant, match, naysayer, negativist, noncooperator, objector, obstructionist, obstructive, oppositionist, oppugnant, plaintiff, protester, quarreler, resister, scrapper, wrangler

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