Source : Webster's Revised Unabridged Dictionary (1913)

Reversion \Re*ver"sion\, n. [F. r['e]version, L. reversio a
   turning back. See {Revert}.]
   1. The act of returning, or coming back; return. [Obs.]

            After his reversion home, [he] was spoiled, also, of
            all that he brought with him.         --Foxe.

   2. That which reverts or returns; residue. [Obs.]

            The small reversion of this great navy which came
            home might be looked upon by religious eyes as
            relics.                               --Fuller.

   3. (Law) The returning of an esttate to the grantor or his
      heirs, by operation of law, after the grant has
      terminated; hence, the residue of an estate left in the
      proprietor or owner thereof, to take effect in possession,
      by operation of law, after the termination of a limited or
      less estate carved out of it and conveyed by him. --Kent.

   4. Hence, a right to future possession or enjoiment;
      succession.

            For even reversions are all begged before. --Dryden.

   5. (Annuities) A payment which is not to be received, or a
      benefit which does not begin, until the happening of some
      event, as the death of a living person. --Brande &C.

   6. (Biol.) A return towards some ancestral type or character;
      atavism.

   {Reversion of series} (Alg.), the act of reverting a series.
      See {To revert a series}, under {Revert}, v. t.