prefect

noun

1. 1

   An official of Ancient Rome who controlled or superintended a particular command, charge, department, etc.

   “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”

2. 2

   The head of a department in France.

3. 3

   The head of a prefecture in Japan.

4. 4

   A school pupil in a position of power over other pupils.

5. 5

   A commander.