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head (chief, director) of a section or department
head of a (school) club; head of a (school) team
部長に意見を求められた。
The director asked for my opinion.
息子は野球部の部長に選ばれた。
My son was chosen as captain of the baseball club.
田中部長は会議室にいます。
Department Manager Tanaka is in the conference room.