'Plenum' definitions:

Definition of 'plenum'

(from WordNet)
noun
A meeting of a legislative body at which all members are present; "the plenum will vote on all tax increases"
noun
An enclosed space in which the air pressure is higher than outside

Definition of 'Plenum'

From: GCIDE
  • Plenum \Ple"num\, n. [L., fr. plenus full.]
  • 1. That state in which every part of space is supposed to be full of matter; -- opposed to vacuum. --G. Francis. [1913 Webster]
  • 2. (Ventilation) 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. [Webster 1913 Suppl.]

Synonyms of 'plenum'

From: Moby Thesaurus