noun (n)

• an administrative unit of government(noun.group)

  Example:
  The Central Intelligence Agency.
  

  Synonym:
  authority, bureau, federal agency, government agency, office
  

  source: wordnet30
• a business that serves other businesses(noun.group)

  source: wordnet30
• the state of being in action or exerting power(noun.state)

  Example:
  The agency of providence.
  She has free agency.
  

  source: wordnet30
• the state of serving as an official and authorized delegate or agent(noun.state)

  Synonym:
  delegacy, representation
  

  source: wordnet30
• how a result is obtained or an end is achieved(noun.act)

  Example:
  An example is the best agency of instruction.
  

  Synonym:
  means, way
  

  source: wordnet30
• The faculty of acting or of exerting power; the state of being in action; action; instrumentality.(noun)

  source: webster1913