headquarters

Noun

Synonyms: central office main office home office home base HQ military headquarters

WordNet 3.0

Noun (3)

(usually plural) the office that serves as the administrative center of an enterprise“many companies have their headquarters in New York”Synonyms: central office main office home office home base
the military installation from which a commander performs the functions of command“the general's headquarters were a couple of large tents”Synonyms: HQ military headquarters
(plural) a military unit consisting of a commander and the headquarters staff

Webster's Dictionary (GCIDE)

Headquarters \Head"quar`ters\ (-kw[add]r`t[~e]rz), n. pl. [but sometimes used as a n. sing.]

1.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. [1913 Webster]

The brain, which is the headquarters, or office, of intelligence.— Collier.[1913 Webster]

2.The main office from which an organization such as a commercial enterprise is managed; -- usually where the chief executive officer works. [PJC]