late 14c., "state of being earlier," from Old French priorite (14c.), from Medieval Latin prioritatem (nominative prioritas) "fact or condition of being prior," from Latin prior (see prior (adj.)). From c. 1400 as "precedence in right or rank." Wyclif (early 15c.) renders prioritas into (Middle) English as furtherhead.[priority etymology, priority origin, 英语词源]