°A person invested with
full power, especially as the
diplomatic agent of a sovereign state, (originally) charged with handling a certain matter.
"1985: Two of them are hanging up there on Golgotha, and that ought to be enough to show the authority of Rome’s ah plenipotentiary. — Anthony Burgess, Kingdom of the Wicked"
adjective
°Of, or related to a plenipotentiary agent.
synonyms:
plenipotent