Invested with or possessing full power or authority.
Origin
Mid 17th century; earliest use found in Remonstrance of Nobility. From post-classical Latin plenipotent-, plenipotens from classical Latin plēni- + potēns.
Definition of plenipotent in US English:
plenipotent
adjectiveplɪˈnɪpət(ə)nt
Invested with or possessing full power or authority.
Origin
Mid 17th century; earliest use found in Remonstrance of Nobility. From post-classical Latin plenipotent-, plenipotens from classical Latin plēni- + potēns.