(in some British schools) an older student with some authority over younger students and some other responsibilities and advantages （某些英國學校中負責維持紀律等的）學長 - (also Prefect)
an officer responsible for an area of local government in some countries, for example France, Italy and Japan （法、意、日等國家的）地方行政長官；省長；縣長
Word Originlate 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 cent.