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.
- A high administrative official or chief officer, as:
- Any of several high military or civil officials in ancient Rome.
- The chief of police of Paris, France.
- A chief administrative official of a department of France.
- The administrator in charge of discipline at a Jesuit school.
- A student monitor or officer, especially in a private school.