The Collaborative International Dictionary of English v.0.48:

Repel \Re**pel"\ (r?-p?l"), v. t. [imp. & p. p. Repelled
   (-p?ld"); p. pr. & vb. n. Repelling.] [L. repellere,
   repulsum; pref. re- re- + pellere to drive. See Pulse a
   beating, and cf. Repulse, Repeal.]
   1. To drive back; to force to return; to check the advance
      of; to repulse as, to repel an enemy or an assailant.
      [1913 Webster]

            Hippomedon repelled the hostile tide. --Pope.
      [1913 Webster]

            They repelled each other strongly, and yet attracted
            each other strongly.                  --Macaulay.
      [1913 Webster]

   2. To resist or oppose effectually; as, to repel an assault,
      an encroachment, or an argument.
      [1913 Webster]

            [He] gently repelled their entreaties. --Hawthorne.
      [1913 Webster]

   Syn: Tu repulse; resist; oppose; reject; refuse.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Repel \Re*pel"\, v. i.
   To act with force in opposition to force impressed; to
   exercise repulsion.
   [1913 Webster] Repellence

WordNet (r) 3.0 (2006):

repel
    v 1: cause to move back by force or influence; "repel the
         enemy"; "push back the urge to smoke"; "beat back the
         invaders" [syn: repel, drive, repulse, force back,
         push back, beat back] [ant: attract, draw, draw
         in, pull, pull in]
    2: be repellent to; cause aversion in [syn: repel, repulse]
       [ant: appeal, attract]
    3: force or drive back; "repel the attacker"; "fight off the
       onslaught"; "rebuff the attack" [syn: repel, repulse,
       fight off, rebuff, drive back]
    4: reject outright and bluntly; "She snubbed his proposal" [syn:
       rebuff, snub, repel]
    5: fill with distaste; "This spoilt food disgusts me" [syn:
       disgust, gross out, revolt, repel]

Moby Thesaurus II by Grady Ward, 1.0:

143 Moby Thesaurus words for "repel":
   abjure, anticipate, appall, avert, bar, be proof against, bear up,
   bear up against, beat back, beat off, block, blunt, brush aside,
   brush off, buck, chase, chase away, chase off, check, chill, chuck,
   chuck out, combat, contemn, contest, contradict, cool, counter,
   cut, damp, dampen, debar, decline, deflect, defy, deny, despise,
   deter, disaffect, disapprove, discard, disclaim, discount,
   discourage, disdain, disgust, dishearten, disincline, disinterest,
   dismiss, disown, dispute, disregard, distract, divert, drive away,
   drive back, duel, endure, estop, except, exclude, fend, fend off,
   fight, forbid, foreclose, forestall, forswear, give offense,
   gross out, help, hinder, hold at bay, hold off, hold out, hold up,
   horrify, ignore, indispose, keep at bay, keep from, keep off,
   nauseate, obstruct, obviate, offend, oppose, pack off, parry,
   pass by, pass up, preclude, prevent, prohibit, push aside,
   push back, put back, put off, quench, rebuff, rebut, recant,
   refuse, refuse to consider, refuse to receive, reject, reluct,
   renounce, repudiate, repulse, resist, revolt, rule out, save,
   scout, send away, send off, send packing, shock, shove away,
   sicken, snub, spurn, stand, stand up, stave off, stop, throw away,
   throw out, thrust back, traverse, turn aside, turn away, turn back,
   turn from, turn off, turn out, turn the stomach, waive, ward off,
   wean from, withstand