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]

Moby Thesaurus II by Grady Ward, 1.0:

65 Moby Thesaurus words for "revocation":
   abjuration, abjurement, abolishment, abolition, abrogation,
   absolute contradiction, annulment, cancel, canceling, cancellation,
   cassation, contradiction, contrary assertion, contravention,
   controversion, countering, countermand, counterorder, crossing,
   defeasance, denial, disaffirmation, disallowance, disavowal,
   disclaimer, disclamation, disowning, disownment, disproof,
   expatriation, forswearing, gainsaying, impugnment, invalidation,
   nullification, palinode, palinody, recall, recantation, refutation,
   renege, reneging, renouncement, renunciation, repeal, repudiation,
   rescinding, rescindment, rescission, retractation, retraction,
   reversal, revoke, revokement, setting aside, suspension, unsaying,
   vacation, vacatur, voidance, voiding, waiver, waiving, withdrawal,
   write-off