The Collaborative International Dictionary of English v.0.48:

Disclaim \Dis*claim"\, v. t. [imp. & p. p. Disclaimed; p. pr.
   & vb. n. Disclaiming.]
   1. To renounce all claim to deny; ownership of, or
      responsibility for; to disown; to disavow; to reject.
      [1913 Webster]

            He calls the gods to witness their offense;
            Disclaims the war, asserts his innocence. --Dryden.
      [1913 Webster]

            He disclaims the authority of Jesus.  --Farmer.
      [1913 Webster]

   2. To deny, as a claim; to refuse.
      [1913 Webster]

            The payment was irregularly made, if not disclaimed.
                                                  --Milman.
      [1913 Webster]

   3. (Law) To relinquish or deny having a claim; to disavow
      another's claim; to decline accepting, as an estate,
      interest, or office. --Burrill.

   Syn: To disown; disavow; renounce; repudiate.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Disclaim \Dis*claim"\, v. t.
   To disavow or renounce all part, claim, or share.
   --Blackstone.
   [1913 Webster]

   Disclaim in, Disclaim from, to disown; to disavow. [Obs.]
      "Nature disclaims in thee." --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

disclaim
    v 1: renounce a legal claim or title to [ant: claim, take]
    2: make a disclaimer about; "He disclaimed any responsibility"
       [ant: claim]

Moby Thesaurus II by Grady Ward, 1.0:

105 Moby Thesaurus words for "disclaim":
   abjure, assert the contrary, back down, back out, backwater,
   be unmoved, be unwilling, beg off, belie, belittle, brush aside,
   challenge, chuck, chuck out, climb down, contemn, contest,
   contradict, contravene, controvert, counter, crawfish out,
   criticize, cross, decline, decline to accept, deny, deprecate,
   despise, disaffirm, disagree, disallow, disapprove, disavow,
   discard, discount, disdain, dismiss, disown, disparage, disprove,
   dispute, disregard, dissent, eat crow, eat humble pie, except,
   exclude, forswear, gainsay, hold out against, ignore, impugn,
   join issue upon, minimize, negate, negative, not accept, not admit,
   not buy, not consent, not hear of, not think of, nullify, oppose,
   pass by, pass up, push aside, rebuff, recant, refuse,
   refuse consent, refuse to admit, refuse to consider, refute,
   reject, renege, renounce, repel, repudiate, repulse,
   resist entreaty, resist persuasion, retract, revoke, say nay,
   say no, scout, shove away, spurn, stand aloof, swallow, take back,
   take issue with, throw away, throw out, traverse, turn away,
   turn down, turn out, unsay, vote nay, vote negatively, waive,
   withdraw