noun (n)

• a formal public statement(noun.communication)

  Example:
  The government made an announcement about changes in the drug war.
  

  Synonym:
  annunciation, declaration, proclamation
  

  source: wordnet30
• a public statement containing information about an event that has happened or is going to happen(noun.communication)

  Example:
  The announcement appeared in the local newspaper.
  

  Synonym:
  promulgation
  

  source: wordnet30
• The act of announcing, or giving notice; that which announces; proclamation; publication.(noun)

  source: webster1913