noun (n)

• a farewell oration (especially one delivered during graduation exercises by an outstanding member of a graduating class)(noun.communication)

  Synonym:
  valedictory, valedictory address, valedictory oration
  

  source: wordnet30
• the act of saying farewell(noun.act)

  source: wordnet30
• A farewell; a bidding farewell.(noun)

  source: webster1913