The Collaborative International Dictionary of English v.0.48:

Revocation \Rev`o*ca"tion\, n. [L. revocatio: cf. F.
   r['e]vocation.]
   1. The act of calling back, or the state of being recalled;
      recall.
      [1913 Webster]

            One that saw the people bent for the revocation of
            Calvin, gave him notice of their affection.
                                                  --Hooker.
      [1913 Webster]

   2. The act by which one, having the right, annuls an act
      done, a power or authority given, or a license, gift, or
      benefit conferred; repeal; reversal; as, the revocation of
      an edict, a power, a will, or a license.
      [1913 Webster]

WordNet (r) 3.0 (2006):

revocation
    n 1: the state of being cancelled or annulled [syn:
         revocation, annulment]
    2: the act (by someone having the authority) of annulling
       something previously done; "the revocation of a law"