Source : Webster's Revised Unabridged Dictionary (1913)

Oppose \Op*pose"\, v. t. [imp. & p. p. {Opposed}; p. pr. & vb.
   n. {Opposing}.] [F. opposer. See {Ob-}, {Pose}, and cf.2d
   {Appose}, {Puzzle}, n. Cf.L. opponere, oppositum.]
   1. To place in front of, or over against; to set opposite; to
      exhibit.

            Her grace sat down . . . In a rich chair of state;
            opposing freely The beauty of her person to the
            people.                               --Shak.

   2. To put in opposition, with a view to counterbalance or
      countervail; to set against; to offer antagonistically.

            I may . . . oppose my single opinion to his.
                                                  --Locke.

   3. To resist or antagonize by physical means, or by
      arguments, etc.; to contend against; to confront; to
      resist; to withstand; as, to oppose the king in battle; to
      oppose a bill in Congress.

   4. To compete with; to strive against; as, to oppose a rival
      for a prize.

            I am . . . too weak To oppose your cunning. --Shak.

   Syn: To combat; withstand; contradict; deny; gainsay; oppugn;
        contravene; check; obstruct.

Source : WordNet®

opposing
     adj 1: characterized by active hostility; "opponent (or opposing)
            armies" [syn: {opponent}]
     2: acting in opposition to; "the opposing sector of the same
        muscle group"
     3: in opposition to (a policy or attitude etc.); "an opposing
        vote" [syn: {opposed}]