[ plee-nuhm, plen-uhm ]
/ ˈpli nəm, ˈplɛn əm /

noun, plural ple·nums, ple·na [plee-nuh, plen-uh]. /ˈpli nə, ˈplɛn ə/.

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).



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Origin of plenum

1670–80; <Latin, neuter of plēnusfull1, in the phrase plēnum (spatium) full (space) Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for plenum

British Dictionary definitions for plenum

/ (ˈpliːnəm) /

noun plural -nums or -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 matterCompare vacuum (def. 1)
the condition or quality of being full

Word Origin for plenum

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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012