Plenum

Ple´num

n.	1.	That state in which every part of space is supposed to be full of matter; - opposed to vacuum.
	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.

Noun	1.	plenum - a meeting of a legislative body at which all members are present; "the plenum will vote on all tax increases"
	2.	plenum - an enclosed space in which the air pressure is higher than outside