Posse Comitatus Definition
noun
Power of the county.
Webster's New World Law
A sheriff may summon citizens to assist him in making an arrest; hence posse in the traditional Old West sense.
Webster's New World Law
A federal statute prohibiting the Army and Air Force from direct participation in civilian law-enforcement activities.
Webster's New World Law
(figuratively) Any band of men, especially armed or hostile.
Wiktionary
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