Main Entry: ple·num

Pronunciation: \ˈple-nəm, ˈplē-\

Function: noun

Etymology: New Latin, from Latin, neuter of plenus

Date: 1678

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