[plee-nuhm, plen-uhm]
noun, plural plenums, plena [plee-nuh, plen-uh] .
the state or a space in which a gas, usually air, is contained at a pressure greater than atmospheric pressure.
a full assembly, as a joint legislative assembly.
a 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.
the whole of space regarded as being filled with matter (opposed to vacuum ).

1670–80; < Latin, neuter of plēnus full, in the phrase plēnum (spatium) full (space) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
plenum (ˈpliːnəm)
n , pl -nums, -na
1.  an enclosure containing gas at a higher pressure than the surrounding environment
2.  a fully attended meeting or assembly, esp of a legislative body
3.  Compare vacuum (esp in the philosophy of the Stoics) space regarded as filled with matter
4.  the condition or quality of being full
[C17: from Latin: space filled by matter, from plēnus full]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1678, "filled space" (opposite of vacuum), from L. plenum (spatium) "full (space)," neuter of plenus "complete, full" (see plenary). The meaning "of a full assembly of legislators" is first recorded 1772.
Online Etymology Dictionary, © 2010 Douglas Harper
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