plenipotent

from The Collaborative International Dictionary of English v.0.48

Plenipotent \Ple*nip"o*tent\ (pl[-e]*n[i^]p"[-o]*tent), a. [L.
   plenus full + potens, -entis, potent.]
   Possessing full power. [R.] --Milton.
   [1913 Webster]