plenum

Inflections of 'plenum' (n):

ple•num n., pl. ple•nums, ple•na

Physicsthe state or a space in which a gas, usually air, is contained at a pressure greater than atmospheric pressure.
Governmenta full assembly, as a joint legislative assembly.
Buildinga space, usually above a ceiling or below a floor, that can serve as a receiving chamber for air that has been heated or cooled to be distributed to inhabited areas.
Physicsthe whole of space regarded as being filled with matter (opposed to vacuum).

Collins Concise English Dictionary © HarperCollins Publishers::

plenum /ˈpliːnəm/ n ( pl -nums, -na /-nə/)

an enclosure containing gas at a higher pressure than the surrounding environment
a fully attended meeting or assembly, esp of a legislative body
(esp in the philosophy of the Stoics) space regarded as filled with matter
Compare vacuum

Etymology: 17th Century: from Latin: space filled by matter, from plēnus full

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