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English to English noun
| 1 |
a meeting of a legislative body at which all members are present |  | Example: the plenum will vote on all tax increases
source: wordnet30
| 2 |
an enclosed space in which the air pressure is higher than outside | | source: wordnet30
| 3 |
That state in which every part of space is supposed to be full of matter; -- opposed to vacuum. | | source: webster1913
| 4 |
A condition, as in an occupied room, in which the pressure of the air is greater than that of the outside atmosphere; as, a plenum may exist in a hall ventilated by a fan blower. | | source: webster1913
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