Source : Webster's Revised Unabridged Dictionary (1913)

Announcement \An*nounce"ment\, n.
   The act of announcing, or giving notice; that which
   announces; proclamation; publication.

Source : WordNet®

announcement
     n 1: a formal public statement; "the government made an
          announcement about changes in the drug war"; "a
          declaration of independence" [syn: {proclamation}, {annunciation},
           {declaration}]
     2: a public statement about something that is happening or
        going to happen; "the announcement appeared in the local
        newspaper"; "the promulgation was written in English"
        [syn: {promulgation}]