The Collaborative International Dictionary of English v.0.48:

Oppose \Op*pose"\ ([o^]p*p[=o]z"), v. i.
   1. To be set opposite. --Shak.
      [1913 Webster]

   2. To act adversely or in opposition; -- with against or to;
      as, a servant opposed against the act. [Obs.] --Shak.
      [1913 Webster]

   3. To make objection or opposition in controversy.
      [1913 Webster] opposed

The Collaborative International Dictionary of English v.0.48:

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.
      [1913 Webster]

            Her grace sat down . . .
            In a rich chair of state; opposing freely
            The beauty of her person to the people. --Shak.
      [1913 Webster]

   2. To put in opposition, with a view to counterbalance or
      countervail; to set against; to offer antagonistically.
      [1913 Webster]

            I may . . . oppose my single opinion to his.
                                                  --Locke.
      [1913 Webster]

   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.
      [1913 Webster]

   4. To compete with; to strive against; as, to oppose a rival
      for a prize.
      [1913 Webster]

            I am . . . too weak
            To oppose your cunning.               --Shak.
      [1913 Webster]

   Syn: To combat; withstand; contradict; deny; gainsay; oppugn;
        contravene; check; obstruct.
        [1913 Webster]

WordNet (r) 3.0 (2006):

oppose
    v 1: be against; express opposition to; "We oppose the ban on
         abortion"
    2: fight against or resist strongly; "The senator said he would
       oppose the bill"; "Don't fight it!" [syn: fight, oppose,
       fight back, fight down, defend]
    3: contrast with equal weight or force [syn: oppose,
       counterbalance]
    4: set into opposition or rivalry; "let them match their best
       athletes against ours"; "pit a chess player against the
       Russian champion"; "He plays his two children off against
       each other" [syn: pit, oppose, match, play off]
    5: act against or in opposition to; "She reacts negatively to
       everything I say" [syn: react, oppose]
    6: be resistant to; "The board opposed his motion" [syn:
       oppose, controvert, contradict]

The Devil's Dictionary (1881-1906):

OPPOSE, v.  To assist with obstructions and objections.

    How lonely he who thinks to vex
    With bandinage the Solemn Sex!
    Of levity, Mere Man, beware;
    None but the Grave deserve the Unfair.
                                                     Percy P. Orminder