(1):

(a.) First, precedent, or superior in the order of cognition, reason or generality, origin, development, rank, etc.

(2):

(a.) The superior of a priory, and next below an abbot in dignity.

(3):

(a.) Preceding in the order of time; former; antecedent; anterior; previous; as, a prior discovery; prior obligation; - used elliptically in cases like the following: he lived alone [in the time] prior to his marriage.