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plenipotentiary

[plen-uh-puh-ten-shee-er-ee, -shuh-ree] /ˌplɛn ə pəˈtɛn ʃiˌɛr i, -ʃə ri/
noun, plural plenipotentiaries.
1.
a person, especially a diplomatic agent, invested with full power or authority to transact business on behalf of another.
adjective
2.
invested with full power or authority, as a diplomatic agent.
3.
conferring or bestowing full power, as a commission.
4.
absolute or full, as power.
Origin
1635-1645
1635-45; < Medieval Latin plēnipotentiārius. See plenipotent, -i-, -ary
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for plenipotentiary

plenipotentiary

/ˌplɛnɪpəˈtɛnʃərɪ/
adjective
1.
(esp of a diplomatic envoy) invested with or possessing full power or authority
2.
conferring full power or authority
3.
(of power or authority) full; absolute
noun (pl) -aries
4.
a person invested with full authority to transact business, esp a diplomat authorized to represent a country See also envoy1 (sense 1)
Word Origin
C17: from Medieval Latin plēnipotentiārius, from Latin plēnus full + potentiapower
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for plenipotentiary
adj.

1640s, from French plénipotentiaire and directly from Medieval Latin plenipotentiarius "having full power," from Late Latin plenipotens, from Latin plenus "full" (see plenary) + potentem "powerful" (see potent). As a noun from 1650s.

Online Etymology Dictionary, © 2010 Douglas Harper
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