American English

Definition of department noun from the Oxford Advanced American Dictionary



    (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, State Department
  2. 2a 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