The Collaborative International Dictionary of English v.0.48:

Revert \Re*vert"\, v. i.
   1. To return; to come back.
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            So that my arrows
            Would have reverted to my bow again.  --Shak.
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   2. (Law) To return to the proprietor after the termination of
      a particular estate granted by him.
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   3. (Biol.) To return, wholly or in part, towards some
      preexistent form; to take on the traits or characters of
      an ancestral type.
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   4. (Chem.) To change back, as from a soluble to an insoluble
      state or the reverse; thus, phosphoric acid in certain
      fertilizers reverts.
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The Collaborative International Dictionary of English v.0.48:

Revert \Re*vert"\, v. t. [imp. & p. p. Reverted; p. pr. & vb.
   n. Reverting.] [L. revertere, reversum; pref. re- re- +
   vertere to turn: cf. OF. revertir. See Verse, and cf.
   Reverse.]
   1. To turn back, or to the contrary; to reverse.
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            Till happy chance revert the cruel scence. --Prior.
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            The tumbling stream . . .
            Reverted, plays in undulating flow.   --Thomson.
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   2. To throw back; to reflect; to reverberate.
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   3. (Chem.) To change back. See Revert, v. i.
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   To revert a series (Alg.), to treat a series, as y = a + bx
      + cx^2 + etc., where one variable y is expressed in
      powers of a second variable x, so as to find therefrom the
      second variable x, expressed in a series arranged in
      powers of y.
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The Collaborative International Dictionary of English v.0.48:

Revert \Re*vert"\, n.
   One who, or that which, reverts.
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         An active promoter in making the East Saxons converts,
         or rather reverts, to the faith.         --Fuller.
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WordNet (r) 3.0 (2006):

revert
    v 1: go back to a previous state; "We reverted to the old rules"
         [syn: revert, return, retrovert, regress, turn
         back]
    2: undergo reversion, as in a mutation

Moby Thesaurus II by Grady Ward, 1.0:

62 Moby Thesaurus words for "revert":
   back, back up, backslide, cock, come after, come again, come back,
   come last, come up again, cry back to, echo, fall, fall again into,
   fall astern, fall back, fall behind, fall from grace, follow,
   get behind, go back, go back to, go backwards, go behind,
   have a relapse, jerk back, keep coming, lag behind, lapse,
   lapse back, lose ground, pull back, react, reappear, recede,
   recidivate, recur, recur to, regress, relapse, reoccur, repeat,
   resound, resume, retreat, retrocede, retroflex, retrograde,
   retrogress, retrovert, return, return to, reverberate, reverse,
   revert to, sink back, slide back, slip back, take up again, trail,
   trail behind, turn, yield again to