headquartersPronunciation: /hɛdˈkwɔːtəz/Translate headquarters | into French | into German | into Italian | into Spanish Definition of headquarters noun [treated as singular or plural] the premises occupied by a military commander and the commander’s staff. the premises serving as the managerial and administrative centre of an organization: its national headquarters are in Floridaheadquarters in other Oxford dictionaries Definition of headquarters in the US English dictionary