headquarters

noun, plural head·quar·ters. (used with a singular or plural verb)

1. a center of operations, as of the police or a business, from which orders are issued; the chief administrative office of an organization: The operatives were always in touch with headquarters.
2. the offices or working location of a military commander; the place from which a commander customarily issues orders.
3. a military unit consisting of the commander, his staff, and other assistants.

verb (used with object)

1. to situate in headquarters.

verb (used without object)

2. to establish one’s headquarters.

pl n (sometimes functioning as singular)

1. any centre or building from which operations are directed, as in the military, the police, etc
2. a military formation comprising the commander, his staff, and supporting echelons

verb

1. informal, mainly US to place in or establish as headquarters