(n. sing.) The quarters or place of residence of any chief officer, as the general in command of an army, or the head of a police force; the place from which orders or instructions are issued; hence, the center of authority or order.

CP GHQ HQ base base of operations booking office box office branch branch office cabinet center of authority central administration central office central station chambers chancellery chancery closet command post company headquarters consulate corporate headquarters den embassy executive office general headquarters home office legation main office office seat shop study ticket office