[n] the military installation from which a commander performs the functions of command; "his headquarters were a couple of large tents"
[n] the office that serves as the administrative center of an enterprise
[n] a military unit consisting of a commander and the headquarters staff
\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.