late 14c., contraction of procurator (c.1300) "steward or manager of a household;" also "a provider" (see procurator). From late 14c. as "one who acts or speaks for another; spokesman, advocate;" early 15c. as "business manager or financial administrator of a church, college, holy order, etc."
1670s, from proctor (n.). Related: Proctored; proctoring.