department in WordNet English dictionary

1. a specialized sphere of knowledge
   "baking is not my department"; "his work established a new department of literature"
   department 
   
2. a specialized division of a large organization
   "you'll find it in the hardware department"; "she got a job in the historical section of the Treasury"
   department  section 
   
3. the territorial and administrative division of some countries (such as France)
   department