plenary

UK: /ˈpliːnəri/

US: /ˈplinəri, ˈplɛnə-/

US: (plē′nə rē, plen′ə-)

Inflections of 'plenary' (n): npl: plenaries

WordReference Random House Learner's Dictionary of American English © 2025

ple•na•ry /ˈplinəri, ˈplɛnə-/   adj, n., pl. -ries. 
adj. 

1. full;
   complete;
   without limit:
   plenary powers.
2. attended by all qualified members:
   a plenary session of Congress.

n. [countable]

3. a plenary session.

See -plen-.

WordReference Random House Unabridged Dictionary of American English © 2025

ple•na•ry  (plē′nə rē, plen′ə-), adj, n., pl. -ries. 
adj. 

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

n. 

3. a plenary session, meeting, or the like.

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

ple′na•ri•ly, adv. 

Collins Concise English Dictionary © HarperCollins Publishers::

plenary / ˈpliːnərɪ ˈplɛn-/ adjective

1. full, unqualified, or complete: plenary powers, plenary indulgence
2. (of assemblies, councils, etc) attended by all the members

Etymology: 15th Century: from Late Latin plēnārius, from Latin plēnus full; related to Middle English plener; see plenum

ˈplenarily adverb