This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. An assembly or meeting with all members present.

n. A condition, space, or enclosure in which air or other gas is at a pressure greater than that of the outside atmosphere.

n. The condition of being full; fullness.

n. A space completely filled with matter.

n. A space that is completely filled with matter.

n. 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. 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.

n. That state in which every part of space is supposed to be full of matter; -- opposed to vacuum.

n. A condition, as in an occupied room, in which the pressure of the air is greater than that of the outside atmosphere.

n. The fullness of matter in space: the opposite of vacuum: also used to denote fullness in general.

n. A quantity of a gaseous body in an inclosed space greater than would remain there under normal atmospheric pressure.

n. an enclosed space in which the air pressure is higher than outside

n. a meeting of a legislative body at which all members are present

"But it is more usual to employ what is called the plenum process, in which air under high pressure is pumped into the caisson and expels the water, as in a diving bell."

vacuum   

enclosure    group meeting    meeting   

plenum method    system) of ventilation   

plena   

plenary   

fullness    space    assembly   

denim    phenom    venom   

liquore    vband    wall-screen    fore-end    studet    escam    insitum    suadere    tachometer    coactus