late 14c., from O.Fr. repeter "say or do again, get back, demand the return of" (13c.), from L. repetere "do or say again, attack again," from re- "again" + petere "go toward, seek, demand, attack" (see petition). Specific meaning "to take a course of education over again"
is recorded from 1945, Amer.Eng. The noun is first recorded 1556.