Head"quar`ters (?), n. pl. [but sometimes used as a 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.
The brain, which is the headquarters, or office, of intelligence.
Collier.
© Webster 1913.