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n (physics) A space that is completely filled with matter.

n (figuratively) A state of fullness, a great quantity (of something).

n A legislative meeting (especially of the Communist Party) in which all members are present.

n An enclosed space having greater than atmospheric pressure.

n The space above a false ceiling used for cables, ducts etc.

n (computing) A type of network cabling which satisfies plenum-ratings issued by the National Electrical Code. These cables are safer in case of a fire, producing less smoke and fumes.