plenum

noun ple·num \ˈple-nəm, ˈplē-\

Definition of PLENUM

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)

: a general assembly of all members especially of a legislative body

: the quality or state of being full

New Latin, from Latin, neuter of plenus

First Known Use: 1678

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