Groups of people, often armed, organized to catch criminals or maintain order, especially in the Old West; can also mean any organized group of followers.
From Latin 'posse' meaning 'to be able' or 'to have power.' The term was popularized in American frontier history for groups deputized to chase outlaws.
The word 'posse' comes from the same Latin root as 'possible'—both about what you're able to do! It's why in old Westerns sheriffs would gather whoever they could to catch bad guys.
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