Webster's English Dictionary

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opponent

1. op.po.nent \*-'po--n*nt\ n [L opponent-, opponens, prp. of opponere] 1: 
   one that opposes : ADVERSARY  2: a muscle that opposes or counteracts and 
   limits the action of another e than position on the other side as in a 
   debate, election, contest, or conflict; ANTAGONIST implies sharper 
   opposition in a struggle for supremacy; ADVERSARY may carry an additional 
   implication of active hostility SYN syn ANTAGONIST, ADVERSARY: OPPONENT 
   implies little mor 
2. opponent aj 1: OPPOSING, ANTAGONISTIC  2: situated in front : OPPOSITE