1. (n.) A Roman officer who controlled or superintended a particular command, charge, department, etc.; as, the prefect of the aqueducts; the prefect of a camp, of a fleet, of the city guard, of provisions; the pretorian prefect, who was commander of the troops guarding the emperor's person.

2. (n.) A superintendent of a department who has control of its police establishment, together with extensive powers of municipal regulation.

3. (n.) In the Greek and Roman Catholic churches, a title of certain dignitaries below the rank of bishop.

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