(military) general staff, headquarters (group of officers in charge of an army under the control of the commander-in-chief) / (military) headquarters (military installation from which troops are commanded and orders are issued) / (politics) administrative staff (body of staff that administers a political party) / (business) senior management (group of people in charge of a corporation) / (informal, by extension) any administrative body aimed at aiding a professional or academic in their work