Meanings
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1
noun
a meeting attended by all members of a committee, legislature, or other body
The proposal will be debated at tomorrow’s plenum.
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2
noun
an enclosed chamber containing air or another fluid at pressure above the surrounding pressure
A fan forces cool air into the plenum beneath the floor.
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3
noun
a space completely filled with matter, especially in philosophy or physics
The philosopher imagined a plenum in which no void could exist.
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4
noun
a condition of fullness or abundance
The garden offered a fragrant plenum of color and sound.
Thesaurus
Etymology
From Latin plēnum, ‘a full space,’ the neuter of plēnus, ‘full.’ The meeting sense developed through the idea of a session with the full membership present and was reinforced by Russian and German political usage.