prior: Prior the ecclesiastical rank [11] and prior ‘previous’ [18] are ultimately the same word. Both go back to Latin prior ‘former, superior’, a comparative formation based on the Old Latin preposition pri ‘before’. This came in postclassical times to be used as a noun meaning ‘superior officer, administrator’, and it was taken over as such into the terminology of the monastic foundations. [prior etymology, prior origin, 英语词源]