plen·i·po·ten·ti·ar·y 
(plĕn′ə-pə-tĕnshē-ĕr′ē, -shə-rē)
(plĕn′ə-pə-tĕnshē-ĕr′ē, -shə-rē)adj.
Invested with or conferring full powers: a plenipotentiary deputy.
n. pl. plen·i·po·ten·ti·ar·ies
A diplomatic agent, such as an ambassador, fully authorized to represent his or her government.
[Medieval Latin plēnipotentiārius, from Late Latin plēnipotēns, plēnipotent-, invested with full power : Latin plēnus, full; see pelə-1 in the Appendix of Indo-European roots + Latin potēns, powerful; see POTENT.]
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