Source : Webster's Revised Unabridged Dictionary (1913)

Bulletin \Bul"le*tin\, n. [F. bulletin, fr. It. bullettino, dim.
   of bulletta, dim. of bulla, bolla, an edict of the pope, from
   L. bulla bubble. See {Bull} an edict.]
   1. A brief statement of facts respecting some passing event,
      as military operations or the health of some distinguished
      personage, issued by authority for the information of the
      public.

   2. Any public notice or announcement, especially of news
      recently received.

   3. A periodical publication, especially one containing the
      proceeding of a society.

   {Bulletin board}, a board on which announcements are put,
      particularly at newsrooms, newspaper offices, etc.

Source : WordNet®

bulletin
     n : a brief report especially an official statement issued for
         immediate publication or broadcast
     v : make public by bulletin