primacy (n.)youdaoicibaDictYouDict[primacy 词源字典]
late 14c., from Old French primacie (14c., in Modern French spelled primatie) and directly from Medieval Latin primatia "office of a church primate" (late 12c.), from Late Latin primas (genitive primatis) "principal, chief, of the first rank" (see primate).[primacy etymology, primacy origin, 英语词源]