plenum /plēˈnəm/ noun- A space completely filled with matter, opp to vacuum
- (also plenum chamber) a sealed chamber containing pressurized air (aeronautics, etc)
- A full assembly
ORIGIN: L plēnum (spatium) full (space) plēˈnist noun Someone who believes all space to be a plenum plenum system or plenum ventilation noun (architecture) An air-conditioning system in which the air propelled into a building is maintained at a higher pressure than that of the atmosphere |