noun, plural -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.
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.