First Known Use: 1678
Dictionary
plenum
noun ple·num \ˈple-nəm, ˈplē-\
Definition of PLENUM
1
a : 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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Origin of PLENUM
New Latin, from Latin, neuter of plenus
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