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]

Moby Thesaurus II by Grady Ward, 1.0:

240 Moby Thesaurus words for "oppose":
   abjure, agree to differ, agree to disagree, analogize, antagonize,
   array, arrest, assert the contrary, assimilate, attack, balance,
   ban, bar, be antipathetic, be at cross-purposes, be at variance,
   be in dissent, be inimical, be opposed to, beat against,
   beg to differ, belie, blackball, block, bottle up,
   bring into analogy, bring into comparison, buck, bump heads,
   categorically reject, challenge, check, clash, collide, combat,
   compare, compare and contrast, compare with, complain,
   complain loudly, conflict, conflict with, confront, confute,
   contend, contend against, contend with, contest, contradict,
   contrapose, contraposit, contrast, contrast with, contravene,
   controvert, counter, counteract, counterattack, counterbalance,
   countercheck, counterpoise, counterpose, countervail, counterwork,
   cross, curb, dam up, damp, dampen, defy, delay, deny, detain,
   differ, disaffirm, disagree, disagree with, disallow, disapprove,
   disapprove of, disavow, disclaim, discord with, disfavor, disown,
   disprove, dispute, dissent, dissent from, divide on,
   draw a comparison, draw a parallel, drop out, duel, exclude, face,
   face down, face out, face up to, fight, foil, forswear, front,
   frown at, frown down, frown upon, frustrate, gainsay, go against,
   go counter to, grapple with, grimace at, hinder, hold back,
   hold in check, hold up, impede, impugn, inhibit, intercept,
   interfere, interfere with, intermeddle, interrupt, intervene,
   join issue upon, join the opposition, juxtapose in opposition,
   keep back, keep in check, kick against, lie opposite, liken,
   liken to, lock horns, look askance at, look black upon,
   make a stand, match, measure against, meddle, meet head-on,
   metaphorize, militate against, not abide, not accept, not admit,
   not agree, not approve, not go for, not hear of, not hold with,
   nullify, object, object to, obstruct, obviate, offer resistance,
   offset, oppugn, ostracize, parallel, pit, pit against,
   place against, play at cross-purposes, polarize, pose against,
   preclude, prevent, protest, put in opposition, recalcitrate,
   recant, refuse to admit, refute, reject, relate, reluct,
   remonstrate, renounce, repel, repress, repudiate, resist, restrain,
   restrict, retard, retract, revoke, revolt, run a comparison,
   run against, run counter to, say no to, scotch, secede,
   set against, set back, set in contrast, set in opposition, set off,
   set off against, set over against, show fight, similize, slacken,
   slow, snub, stand, stand at bay, stand opposed, stand opposite,
   stand up against, stand up to, stop, strive against, subtend,
   suppress, swim upstream, take back, take exception,
   take exception to, take issue, take issue with, think ill of,
   think little of, thumb down, thwart, traverse, vie, view together,
   view with disfavor, vote against, weigh, weigh against, withdraw,
   withhold assent, withstand, work against



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