[ plee-nuh-ree, plen-uh- ]
/ ˈpli nə ri, ˈplɛn ə- /


full; complete; entire; absolute; unqualified: plenary powers.
attended by all qualified members; fully constituted: a plenary session of Congress.

noun, plural ple·na·ries.

a plenary session, meeting, or the like.

Origin of plenary

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

Related forms

ple·na·ri·ly, adverb

Can be confused

planetary plenary plentiful plenitude Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for plenary

British Dictionary definitions for plenary


/ (ˈpliːnərɪ, ˈplɛn-) /


full, unqualified, or completeplenary powers; plenary indulgence
(of assemblies, councils, etc) attended by all the members

noun plural -ries

a book of the gospels or epistles and homilies read at the Eucharist

Derived Forms

plenarily, adverb

Word Origin for plenary

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