noun (n)

• a special group delegated to consider some matter(noun.group)

  Example:
  A committee is a group that keeps minutes and loses hours.
  

  Synonym:
  commission
  

  source: wordnet30
• a self-constituted organization to promote something(noun.group)

  Synonym:
  citizens committee
  

  source: wordnet30
• One or more persons elected or appointed, to whom any matter or business is referred, either by a legislative body, or by a court, or by any collective body of men acting together.(noun)

  source: webster1913
• One to whom the charge of the person or estate of another, as of a lunatic, is committed by suitable authority; a guardian.(noun)

  source: webster1913