Source : Webster's Revised Unabridged Dictionary (1913)

Revert \Re*vert"\, v. i.
   1. To return; to come back.

            So that my arrows Would have reverted to my bow
            again.                                --Shak.

   2. (Law) To return to the proprietor after the termination of
      a particular estate granted by him.

   3. (Biol.) To return, wholly or in part, towards some
      pre["e]xistent form; to take on the traits or characters
      of an ancestral type.

   4. (Chem.) To change back, as from a soluble to an insoluble
      state or the reverse; thus, phosphoric acid in certain
      fertilizers reverts.

Revert \Re*vert"\, n.
   One who, or that which, reverts.

         An active promoter in making the East Saxons converts,
         or rather reverts, to the faith.         --Fuller.

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.

            Till happy chance revert the cruel scence. --Prior.

            The tumbling stream . . . Reverted, plays in
            undulating flow.                      --Thomson.

   2. To throw back; to reflect; to reverberate.

   3. (Chem.) To change back. See {Revert}, v. i.

   {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.

Source : WordNet®

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