The Collaborative International Dictionary of English v.0.48:

Exclude \Ex*clude"\, v. t. [imp. & p. p. Excluded; p. pr. &
   vb. n. Excluding.] [L. excludere, exclusum; ex out +
   claudere to shut. See Close.]
   1. To shut out; to hinder from entrance or admission; to
      debar from participation or enjoyment; to deprive of; to
      except; -- the opposite to admit; as, to exclude a crowd
      from a room or house; to exclude the light; to exclude one
      nation from the ports of another; to exclude a taxpayer
      from the privilege of voting.
      [1913 Webster]

            And none but such, from mercy I exclude. --Milton.
      [1913 Webster]

   2. To thrust out or eject; to expel; as, to exclude young
      animals from the womb or from eggs.
      [1913 Webster]

   Excluded middle. (logic) The name given to the third of the
      "three logical axioms," so-called, namely, to that one
      which is expressed by the formula: "Everything is either A
      or Not-A." no third state or condition being involved or
      allowed. See Principle of contradiction, under
      Contradiction.
      [1913 Webster]

WordNet (r) 3.0 (2006):

exclude
    v 1: prevent from being included or considered or accepted; "The
         bad results were excluded from the report"; "Leave off the
         top piece" [syn: exclude, except, leave out, leave
         off, omit, take out] [ant: include]
    2: prevent from entering; shut out; "The trees were shutting out
       all sunlight"; "This policy excludes people who have a
       criminal record from entering the country" [syn: exclude,
       keep out, shut out, shut] [ant: admit, include,
       let in]
    3: lack or fail to include; "The cost for the trip excludes food
       and beverages" [ant: include]
    4: prevent from entering; keep out; "He was barred from
       membership in the club" [syn: bar, debar, exclude]
    5: put out or expel from a place; "The unruly student was
       excluded from the game" [syn: eject, chuck out,
       exclude, turf out, boot out, turn out]

Moby Thesaurus II by Grady Ward, 1.0:

197 Moby Thesaurus words for "exclude":
   abjure, abscind, amputate, annihilate, anticipate, avert, ban,
   banish, bar, bar out, bate, blackball, blockade, bob, boot out,
   bounce, brush aside, cast, cast out, categorically reject, chuck,
   chuck out, clip, contemn, contradict, count out, crop, cull, cut,
   cut away, cut off, cut out, debar, decline, defenestrate, deflect,
   deny, deport, despise, deter, detrude, disallow, disapprove,
   disapprove of, discard, discharge, disclaim, discount, discourage,
   disdain, disfavor, disfellowship, dishearten, dismiss, disown,
   disregard, dissent from, dock, eject, eliminate, embargo, enjoin,
   enucleate, eradicate, estop, evict, except, excise, exclude from,
   excommunicate, exile, expatriate, expel, extinguish, extirpate,
   extradite, extrude, fend, fend off, forbid, foreclose, forestall,
   forswear, freeze out, frown at, frown down, frown upon, fugitate,
   get rid of, give the hook, grimace at, heave out, help, ignore,
   inhibit, interdict, isolate, jettison, junk, keep away, keep from,
   keep off, keep out, kick downstairs, kick out, knock off,
   leave out, lock out, look askance at, look black upon, lop,
   mutilate, nip, not approve, not go for, not hear of, not hold with,
   object, object to, obtrude, obviate, omit, oppose, ostracize, oust,
   outlaw, pare, pass by, pass over, pass up, peel, pick out,
   preclude, prevent, prohibit, proscribe, protest, prune, push aside,
   put out, rebuff, recant, refuse, refuse to consider, reject,
   relegate, remove, renounce, repel, repress, repudiate, repulse,
   root out, rule, rule out, rusticate, save, say no to, scout,
   send away, send down, send to Coventry, set apart, set aside,
   shave, shear, shove away, shut out, snub, spurn, stamp out,
   stave off, strike off, strip, strip off, suppress, taboo,
   take exception to, take off, take out, think ill of,
   think little of, throw away, throw out, throw overboard,
   thrust out, thumb down, toss out, transport, truncate, turn aside,
   turn away, turn out, view with disfavor, waive, ward off,
   wipe out