The act of establishing or maintaining a main office or center of operations in a particular location.
From 'headquarter' (mid-1600s), originally a military term combining 'head' (chief, main) and 'quarter' (lodging, area). The -ing suffix indicates a continuous action or process.
During the American Civil War, generals' headquarters were literally marked by flags and tents—the very physical center where decisions radiated outward, which is why we still use this military term for any main office today.
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