Learn how to say Prefectorial correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word prefect:
1chiefly British (in some schools) a senior pupil who is authorized to enforce discipline.
2a chief officer, magistrate, or regional governor in certain countries:
each department is governed by a prefect appointed by the President
a senior magistrate or governor in the ancient Roman world:
Avitus was prefect of Gaul from AD 439
late Middle English (in sense 2): from Old French, from Latin praefectus, past participle of praeficere ‘set in authority over’, from prae ‘before’ + facere ‘make’. sense 1 dates from the early 19th century