/ ˈpliːnəri; NAmE / adjective , noun
■ adjective [ only before noun ] ( formal )
1.
( of meetings, etc. ) to be attended by everyone who has the right to attend :
The new committee holds its first plenary session this week.
2.
without any limit; complete :
The Council has plenary powers to administer the agreement.
■ noun
( pl. -ies ) a plenary meeting
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WORD ORIGIN
late Middle English : from late Latin plenarius complete, from plenus full.