plen·i·po·ten·ti·ar·y (plĕn′ə-pə-tĕnshē-ĕr′ē, -shə-rē)
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, who is fully authorized to represent their 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.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.