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plenary

[plee-nuh-ree, plen-uh-]
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adjective
  1. full; complete; entire; absolute; unqualified: plenary powers.
  2. attended by all qualified members; fully constituted: a plenary session of Congress.
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noun, plural ple·na·ries.
  1. a plenary session, meeting, or the like.
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Origin of plenary

1375–1425; < Late Latin plēnārius (see plenum, -ary); replacing late Middle English plener < Anglo-French < Late Latin plēnāris (see -ar1)
Related formsple·na·ri·ly, adverb
Can be confusedplanetary plenary plentiful plenitude
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for plenary

plenary

adjective
  1. full, unqualified, or completeplenary powers; plenary indulgence
  2. (of assemblies, councils, etc) attended by all the members
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noun plural -ries
  1. a book of the gospels or epistles and homilies read at the Eucharist
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Derived Formsplenarily, adverb

Word Origin

C15: from Late Latin plēnārius, from Latin plēnus full; related to Middle English plener; see plenum
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for plenary

adj.

1510s, earlier plenar (mid-13c.), from Old French plenier, from Medieval Latin plenarius "entire, complete," from Latin plenus "full, filled, greatly crowded; stout, pregnant; abundant, abounding; complete," from PIE *pele- (1) "to fill" (see poly-). Related: Plenarily.

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Online Etymology Dictionary, © 2010 Douglas Harper