noun (n)

• a specialized division of a large organization(noun.group)

  Example:
  You'll find it in the hardware department.
  

  Synonym:
  section
  

  source: wordnet30
• the territorial and administrative division of some countries (such as France)(noun.location)

  source: wordnet30
• a specialized sphere of knowledge(noun.cognition)

  Example:
  Baking is not my department.
  His work established a new department of literature.
  

  source: wordnet30
• Act of departing; departure.(noun)

  source: webster1913