predesignate

adj

1. (not-comparable)Designated in advance.
2. (not-comparable)Having its quantity indicated by a verbal sign, as with "all", "none", etc.

verb

1. (transitive)To designate in advance.

   “The agent had to dead-drop the locker key to the PGU by some simple means, such as by taping it underneath a predesignated park bench, where it could be retrieved unobtrusively, usually by an officer under illegal cover.”