noun (n)

• official notice that you have been fired from your job(noun.communication)

  Synonym:
  dismissal, pink slip
  

  source: wordnet30
• the termination of someone's employment (leaving them free to depart)(noun.act)

  Synonym:
  discharge, dismissal, firing, liberation, release, sack, sacking
  

  source: wordnet30
• The act dismissing or sending away; permission to leave; leave to depart; dismissal; as, the dismission of the grand jury.(noun)

  source: webster1913