From The Collaborative International Dictionary of English v.0.48:
Prior \Pri"or\, n. [OE. priour, OF. priour, prior, priur, F.
prieur, from L. prior former, superior. See Prior, a.]
1. (Eccl.) The superior of a priory, and next below an abbot
in dignity.
[1913 Webster]
2. a chief magistrate, as in the republic of Florence in the
middle ages. --[RHUD]
[PJC]
Conventical prior, or Conventual prior, a prior who is at
the head of his own house. See the Note under Priory.
Claustral prior, an official next in rank to the abbot in a
monastery; prior of the cloisters.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Prior \Pri"or\, n.
a prior conviction; -- said of an accused criminal.
[informal]
[PJC]
From The Collaborative International Dictionary of English v.0.48:
Prior \Pri"or\, a. [L. prior former, previous, better, superior;
compar. corresponding to primus first, and pro for. See
Former, and cf. Prime, a., and Pre-, Pro-.]
1. 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.
[1913 Webster]
2. First, precedent, or superior in the order of cognition,
reason or generality, origin, development, rank, etc.
[Webster 1913 Suppl.]