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plenum

/ˈpliːnəm/
noun
1 An assembly of all the members of a group or committee.
2 Physics
A space completely filled with matter, or the whole of space so regarded.

Origin
Late 17th century: from Latin, literally ‘full space’,
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The committee met in plenary session. As a result, there were heated discussions from the varied factions. There was little need for the furnace to fill its plenum with hot air, such air being provided by the committee itself.