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.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a scrap or morsel of food left at a meal.
a gadget; dingus; thingumbob.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a fool or simpleton; ninny.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.