[plen.i.po.ten.tia.ry] adj [ML plenipotentiarius, adj. & n., fr. LL plenipotent-, plenipotens] (ca. 1645) 1: invested with full power
2: of or relating to a plenipotentiary
[2]plenipotentiary n, pl -ries (ca. 1656): a person and esp. a diplomatic agent invested with full power to transact business