plenum
/ˈplɛnəm/ noun C2- A space that is completely filled with matter.
- A state of fullness, a great quantity (of something).
- A legislative meeting (especially of the Communist Party) in which all members are present.
- An enclosed space having greater than atmospheric pressure.
- The space above a false ceiling used for cables, ducts etc.
- A type of network cabling which satisfies a given plenum rating for the purpose of fire safety.
Plural plenums
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