The Collaborative International Dictionary of English v.0.48:

Revenge \Re*venge"\, v. t. [imp. & p. p. Revenged, p. pr. &
   vb. n. Revenging.] [OF. revengier, F. revancher; pref. re-
   re- + OF. vengier to avenge, revenge, F. venger, L.
   vindicare. See Vindicate, Vengerance, and cf.
   Revindicate.]
   1. To inflict harm in return for, as an injury, insult, etc.;
      to exact satisfaction for, under a sense of injury; to
      avenge; -- followed either by the wrong received, or by
      the person or thing wronged, as the object, or by the
      reciprocal pronoun as direct object, and a preposition
      before the wrong done or the wrongdoer.
      [1913 Webster]

            To revenge the death of our fathers.  --Ld. Berners.
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            The gods are just, and will revenge our cause.
                                                  --Dryden.
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            Come, Antony, and young Octavius, come,
            Revenge yourselves alone on Cassius.  --Shak.
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   2. To inflict injury for, in a spiteful, wrong, or malignant
      spirit; to wreak vengeance for maliciously.
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   Syn: To avenge; vindicate. See Avenge.
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The Collaborative International Dictionary of English v.0.48:

Revenge \Re*venge"\, v. i.
   To take vengeance; -- with upon. [Obs.] "A bird that will
   revenge upon you all." --Shak.
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The Collaborative International Dictionary of English v.0.48:

Revenge \Re*venge"\, n.
   1. The act of revenging; vengeance; retaliation; a returning
      of evil for evil.
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            Certainly, in taking revenge, a man is even with his
            enemy; but in passing it over he is superior.
                                                  --Bacon.
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   2. The disposition to revenge; a malignant wishing of evil to
      one who has done us an injury.
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            Revenge now goes
            To lay a complot to betray thy foes.  --Shak.
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            The indulgence of revenge tends to make men more
            savage and cruel.                     --Kames.
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WordNet (r) 3.0 (2006):

revenge
    n 1: action taken in return for an injury or offense [syn:
         retaliation, revenge]
    v 1: take revenge for a perceived wrong; "He wants to avenge the
         murder of his brother" [syn: revenge, avenge,
         retaliate]

Moby Thesaurus II by Grady Ward, 1.0:

51 Moby Thesaurus words for "revenge":
   amends, atonement, avenge, avengement, avenging, balancing,
   comeuppance, commutation, compensation, counteraction,
   counterbalancing, counterblow, defend, desert, deserts,
   even the score, expiation, get, get even with, indemnification,
   indemnity, just deserts, justify, launch a vendetta, lex talionis,
   offsetting, punish, punishment, quittance, recompense,
   rectification, redress, reparation, repayment, reprisal, requital,
   restitution, retaliate, retaliation, retribution, revanche, reward,
   satisfaction, spitefulness, substitution, take revenge, vengeance,
   vindicate, vindictiveness, what is due, what is merited