Definition of plenum
1a
: a space or all space every part of which is full of matter
b
: an air-filled space in a structure
especially
: one that receives air from a blower for distribution (as in a ventilation system)
2
: a general assembly of all members especially of a legislative body
3
: the quality or state of being full
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Merriam-Webster unabridged
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Time Traveler for plenum
The first known use of plenum was in 1678
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