According to Black's Law Dictionary this is, "The entire population of a county above the age of 15, which a sheriff may summon to his assistance in certain cases as to aid him in keeping the peace, in pursuing and arresting felons, etc."

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The definition given matches with the concept of "posse comitatus", which refers to the power of a sheriff to summon a group of citizens to assist in law enforcement matters.

According to Black's Law Dictionary This Is, "The Entire Population