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.
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            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:

Revenging \Re*ven"ging\, a.
   Executing revenge; revengeful. -- Re*ven"ging*ly, adv.
   --Shak.
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