noun (n)

• the state of being cancelled or annulled(noun.state)

  Synonym:
  revocation
  

  source: wordnet30
• (law) a formal termination (of a relationship or a judicial proceeding etc)(noun.act)

  Synonym:
  invalidation
  

  source: wordnet30
• the act of abrogating; an official or legal cancellation(noun.act)

  Synonym:
  abrogation, repeal
  

  source: wordnet30
• The act of annulling; abolition; invalidation.(noun)

  source: webster1913