noun (n)

• a meeting for execution of a group's functions(noun.communication)

  Example:
  It was the opening session of the legislature.
  

  source: wordnet30
• the time during which a school holds classes(noun.time)

  Synonym:
  academic session, academic term, school term
  

  source: wordnet30
• a meeting devoted to a particular activity(noun.act)

  Example:
  A filming session.
  A gossip session.
  

  source: wordnet30
• a meeting of spiritualists(noun.group)

  Synonym:
  seance, sitting
  

  source: wordnet30
• The act of sitting, or the state of being seated.(noun)

  source: webster1913