noun (n)

• a festival commemorating the announcement of the Incarnation by the angel Gabriel to the Virgin Mary; a quarter day in England, Wales, and Ireland(noun.time)

  Synonym:
  annunciation day, lady day, march 25
  

  source: wordnet30
• (Christianity) the announcement to the Virgin Mary by the angel Gabriel of the incarnation of Christ(noun.communication)

  source: wordnet30
• a formal public statement(noun.communication)

  Synonym:
  announcement, declaration, proclamation
  

  source: wordnet30
• The act of announcing; announcement; proclamation; as, the annunciation of peace.(noun)

  source: webster1913