American English

Definition of department noun from the Oxford Advanced American Dictionary

      

    department

     noun
    noun
    NAmE//dɪˈpɑrtmənt//
     
    (abbreviation Dept.)
     
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  1. 1  a section of a large organization such as a government, business, university, etc. the Department of Defense the Treasury Department a government/university, etc. department the marketing/sales, etc. department the English department see also police department, the State Department
  2. 2 a section of a large store that sells a particular type of goods the children's department
  3. Idioms
    be somebody's department (informal)
     
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    to be something that someone is responsible for or knows a lot about Don't ask me about it—that's her department.
See the Oxford Advanced Learner's Dictionary entry: department