- 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).
Origin of plenum
Examples from the Web for plenum
Referendum Law inches closer to basic law status after plenum vote.Fair Assumption: No IDF In Palestine
August 2, 2013
He had left the world a plenum, and he now finds it a vacuum.Letters on England
The two departments, united, form the "Plenum" of the Senate.Through Finland in Carts
Ethel Brilliana Alec-Tweedie
The two great principles of nature are a vacuum, and a plenum.Christianity and Greek Philosophy
Benjamin Franklin Cocker
The same is true of many other facts besides a plenum and a vacuum.Curiosities of Heat
Lyman B. Tefft
Hence atoms and the void are also called the plenum and the vacuum.A Critical History of Greek Philosophy
W. T. Stace
- 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 and History for plenum
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.