Wiktionary
plenipotential
a. Pertaining to a plenipotentiary; having full authority. (from 17th c.)
Usage examples of "plenipotential".
One of the privileges of being the heir of a Minister Plenipotential was that Caissa ranked just below the Triadic heirs and above Cavernii.
Then his clothing settled into a firmer pattern of his colors but Caissa knew that Baythan, Minister Plenipotential, was under stress.