The Collaborative International Dictionary of English v.0.48:

Deny \De*ny"\, v. t. [imp. & p. p. Denied; p. pr. & vb. n.
   Denying.] [OE. denien, denaien, OF. denier, deneer, F.
   d['e]nier, fr. L. denegare; de- + negare to say no, deny. See
   Negation.]
   1. To declare not to be true; to gainsay; to contradict; --
      opposed to affirm, allow, or admit.
      [1913 Webster]

   Note: We deny what another says, or we deny the truth of an
         assertion, the force of it, or the assertion itself.
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   2. To refuse (to do something or to accept something); to
      reject; to decline; to renounce. [Obs.] "If you deny to
      dance." --Shak.
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   3. To refuse to grant; to withhold; to refuse to gratify or
      yield to; as, to deny a request.
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            Who finds not Providence all good and wise,
            Alike in what it gives, and what denies? --Pope.
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            To some men, it is more agreeable to deny a vicious
            inclination, than to gratify it.      --J. Edwards.
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   4. To disclaim connection with, responsibility for, and the
      like; to refuse to acknowledge; to disown; to abjure; to
      disavow.
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            The falsehood of denying his opinion. --Bancroft.
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            Thou thrice denied, yet thrice beloved. --Keble.
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   To deny one's self, to decline the gratification of
      appetites or desires; to practice self-denial.
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            Let him deny himself, and take up his cross. --Matt.
                                                  xvi. 24.
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The Collaborative International Dictionary of English v.0.48:

Deny \De*ny"\, v. i.
   To answer in ??? negative; to declare an assertion not to be
   true.
   [1913 Webster]

         Then Sarah denied, saying, I laughed not; for she was
         afraid.                                  --Gen. xviii.
                                                  15.
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WordNet (r) 3.0 (2006):

deny
    v 1: declare untrue; contradict; "He denied the allegations";
         "She denied that she had taken money" [ant: acknowledge,
         admit]
    2: refuse to accept or believe; "He denied his fatal illness"
    3: refuse to grant, as of a petition or request; "The dean
       denied the students' request for more physics courses"; "the
       prisoners were denied the right to exercise for more than 2
       hours a day"
    4: refuse to let have; "She denies me every pleasure"; "he
       denies her her weekly allowance" [syn: deny, refuse]
       [ant: allow, grant]
    5: deny oneself (something); restrain, especially from indulging
       in some pleasure; "She denied herself wine and spirits" [syn:
       deny, abnegate]
    6: deny formally (an allegation of fact by the opposing party)
       in a legal suit [syn: traverse, deny]
    7: refuse to recognize or acknowledge; "Peter denied Jesus"

Moby Thesaurus II by Grady Ward, 1.0:

162 Moby Thesaurus words for "deny":
   abandon, abjure, abstain, answer, answer conclusively, argue down,
   assert the contrary, avoid, back down, back out, backwater, ban,
   bar, be contrary to, begrudge, belie, brush aside,
   call into question, challenge, chuck, chuck out, climb down,
   close the hand, confound, confute, constrain, contemn, contest,
   contradict, contravene, controvert, counter, crawfish out, cross,
   crush, curb, debar, decline, defeat, demolish, desert, despise,
   disaffirm, disallow, disapprove, disavow, disbelieve, discard,
   disclaim, discount, discredit, disdain, dismiss, disown,
   dispose of, disprove, dispute, disregard, eat crow, eat humble pie,
   embargo, enjoin, eschew, except, exclude, exclude from, finish,
   floor, forbear, forbid, forgo, forsake, forswear, gag on, gainsay,
   grudge, hold back, ignore, impugn, inhibit, interdict,
   join issue upon, keep back, misbelieve, negate, negative, nonplus,
   not accept, not admit, not believe, not buy, not swallow, nullify,
   oppose, oppugn, outlaw, overthrow, overturn, overwhelm, parry,
   pass by, pass up, preclude, prevent, prohibit, proscribe,
   push aside, put to silence, rebuff, rebut, recall, recant,
   reduce to silence, refrain, refuse, refuse to admit,
   refuse to consider, refuse to credit, refute, reject, renege,
   renounce, repel, repress, repudiate, repulse, restrain, retract,
   revoke, rule out, sacrifice, say no to, scout, settle, shove away,
   shun, shut out, shut up, silence, smash all opposition, spurn,
   squash, squelch, subvert, suppress, swallow, taboo, take back,
   take issue with, throw away, throw out, traverse, turn away,
   turn down, turn out, unbelieve, undermine, unsay, upset, waive,
   withdraw, withhold