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plenum

[plee-nuh m, plen-uh m] /ˈpli nəm, ˈplɛn əm/
noun, plural plenums, plena
[plee-nuh, plen-uh] /ˈpli nə, ˈplɛn ə/ (Show IPA)
1.
the state or a space in which a gas, usually air, is contained at a pressure greater than atmospheric pressure.
2.
a full assembly, as a joint legislative assembly.
3.
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.
4.
the whole of space regarded as being filled with matter (opposed to vacuum).
Origin
1670-1680
1670-80; < Latin, neuter of plēnus full, in the phrase plēnum (spatium) full (space)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for plenums

plenum

/ˈpliːnəm/
noun (pl) -nums, -na (-nə)
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.
(esp in the philosophy of the Stoics) space regarded as filled with matter Compare vacuum (sense 1)
4.
the condition or quality of being full
Word Origin
C17: from Latin: space filled by matter, from plēnus full
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for plenums

plenum

n.

1670s, "filled space" (opposite of vacuum), from Latin plenum (spatium) "full (space)," neuter of adjective 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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