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From Latinplēnum, noun use of neuter of plēnus(“full”). The sense of "legislative meeting" is a semantic loan from Russianпле́нум(plénum, “plenary session”), from the same Latin source.
1946, Bertrand Russell, A History of Western Philosophy:
The idea was that a thing could only move into an empty place, and that, in a plenum, there are no empty places.
2001, Edward Grant, God and Reason in the Middle Ages, page 176:
The key to understanding medieval interpretations of motion in hypothetically void space is to realize that medieval natural philosophers analyzed the same bodies in the void that they discussed in the plenum of their ordinary world.
He lay on the long stone slant down to the slapping waves, his denim shorts, sneakers, and socks under his head for a pillow, feeling the splendour of distance in all directions, the liquid silence, the plenum of aloneness.
(computing) A type of network cabling which satisfies plenum-ratings issued by the National Electrical Code. These cables produce less smoke and fumes in the event of fire.
^ Mirosław Bańko, Lidia Wiśniakowska (2021) “plenum”, in Wielki słownik wyrazów obcych, →ISBN
^ Stanisław Dubisz, editor (2003), “plenum”, in Uniwersalny słownik języka polskiego [Universal dictionary of the Polish language] (in Polish), volumes 1-4, Warsaw: Wydawnictwo Naukowe PWN SA, →ISBN