The Collaborative International Dictionary of English v.0.48:

Notification \No`ti*fi*ca"tion\, n. [Cf. F. notification. See
   Notify.]
   1. The act of notifying, or giving notice; the act of making
      known; especially, the act of giving official notice or
      information to the public or to individuals, corporations,
      companies, or societies, by words, by writing, or by other
      means.
      [1913 Webster]

   2. Notice given in words or writing, or by signs.
      [1913 Webster]

   3. The writing which communicates information; an
      advertisement, or citation, etc.
      [1913 Webster]

WordNet (r) 3.0 (2006):

notification
    n 1: an accusation of crime made by a grand jury on its own
         initiative [syn: presentment, notification]
    2: informing by words [syn: telling, apprisal,
       notification]
    3: a request for payment; "the notification stated the grace
       period and the penalties for defaulting" [syn:
       notification, notice]

Moby Thesaurus II by Grady Ward, 1.0:

116 Moby Thesaurus words for "notification":
   account, acquaintance, admonishment, admonition, alarm,
   announcement, annunciation, bench warrant, blue book, briefing,
   bulletin, bulletin board, capias, caution, caveat, circular,
   communication, communique, conveyance, data, datum, death warrant,
   declaration, deterrent example, directory, disclosure, dispatch,
   edict, encyclical, enlightenment, enunciation, evidence, example,
   facts, factual information, familiarization, fieri facias,
   final notice, final warning, gen, general information, giving,
   guidebook, habere facias possessionem, handout, hard information,
   hint, impartation, imparting, impartment, incidental information,
   info, information, injunction, instruction, intelligence,
   interdict, knowledge, lesson, light, mandamus, mandate,
   mandatory injunction, manifesto, mention, message, mittimus,
   monition, moral, nisi prius, notice, object lesson, position paper,
   precept, presentation, process, proclamation, program, programma,
   prohibitory injunction, promotional material, pronouncement,
   pronunciamento, proof, public notice, publication, publicity,
   release, report, search warrant, sharing, sidelight, statement,
   telling, the dope, the goods, the know, the scoop, threat, tip-off,
   transfer, transference, transmission, transmittal, ukase,
   ultimatum, verbum sapienti, warning, warning piece, warrant,
   warrant of arrest, warrant of attorney, white book, white paper,
   word, writ