prefect

1. (historical) An official of Ancient Rome who controlled or superintended a particular command, charge, department, etc.Examples: "the prefect of the aqueducts; the prefect of a camp, of a fleet, of the city guard, or of provisions; the pretorian prefect, who was commander of the troops guarding the emperor's person"; "Or think of a decent young citizen in a toga - perhaps too much dice, you know - coming out here in the train of some prefect, or tax-gatherer, or trader even, to mend his fortunes."; "It seems that in the autumn of 803 he went on leave. His uncle Po Chi-chên, had recently been moved from his post at Hsü-chou and promoted to be Prefect of Hsü-chʻang in Central Honan."Synonyms: provost

2. (British) A school pupil in a position of power over other pupils.