Plenum

[pli:nәm]

(noun.) an enclosed space in which the air pressure is higher than outside.

(noun.) a meeting of a legislative body at which all members are present; 'the plenum will vote on all tax increases'.

Editor: Stanton--From WordNet

(n.) That state in which every part of space is supposed to be full of matter; -- opposed to vacuum.

Typist: Sophie