noun (n)

• a decree that prohibits something(noun.communication)

  Synonym:
  ban, prohibition
  

  source: wordnet30
• rejection by means of an act of banishing or proscribing someone(noun.act)

  Synonym:
  banishment
  

  source: wordnet30
• The act of proscribing; a dooming to death or exile; outlawry; specifically, among the ancient Romans, the public offer of a reward for the head of a political enemy; as, under the triumvirate, many of the best Roman citizens fell by proscription.(noun)

  source: webster1913