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

1375–1425; < Late Latin plēnārius (see plenum, -ary); replacing late Middle English plener < Anglo-French < Late Latin plēnāris (see -ar1)

plenarily, adverb

planetary, plenary, plentiful, plenitude. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
plenary (ˈpliːnərɪ, ˈplɛn-)
1.  full, unqualified, or complete: plenary powers; plenary indulgence
2.  (of assemblies, councils, etc) attended by all the members
n , -ries
3.  a book of the gospels or epistles and homilies read at the Eucharist
[C15: from Late Latin plēnārius, from Latin plēnus full; related to Middle English plener; see plenum]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1510s, earlier plenar (late 13c.), from M.L. plenarius "entire, complete," from L. plenus "full," from PIE *ple- "to be full" (see poly-).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Monday will find the Convention ready for business with the opening of the
  first plenary session.
Generally, the plenary session of the academy meets every two years.
We both were done for the day and went for pre-plenary address drinks.
Several controversial changes were given unobstructed passage through committee
  and plenary sessions.
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