Meanings
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Thesaurus
Simplified etymology
Posse comes from medieval Latin posse, meaning “power,” and ultimately from Latin posse, “to be able.” In mid-17th-century Britain it meant an assembled force, especially the able-bodied local men whom a sheriff could summon to suppress a riot or pursue criminals.
Etymology
Shortened from Medieval Latin posse comitatus, literally 'the power of the county,' the body of able men a sheriff could summon to enforce the law. In modern informal English, posse broadened to any close group of friends or associates.