noun (n)

• a vaguely specified concern(noun.cognition)

  Example:
  It is none of your affair.
  

  Synonym:
  matter, thing
  

  source: wordnet30
• a usually secretive or illicit sexual relationship(noun.state)

  Synonym:
  affaire, amour, intimacy, involvement, liaison
  

  source: wordnet30
• a vaguely specified social event(noun.event)

  Example:
  The party was quite an affair.
  

  Synonym:
  function, occasion, social function, social occasion
  

  source: wordnet30
• That which is done or is to be done; matter; concern; as, a difficult affair to manage; business of any kind, commercial, professional, or public; -- often in the plural. "At the head of affairs." Junius.(noun)

  source: webster1913