1. 
   plenum
   [n] - an enclosed space in which the air pressure is higher than outside
   Found op http://www.webdictionary.co.uk/definition.php?query=plenum
   
   
2. 
   Plenum
   The air handing space between walls, under structural floors, and above drop ceilings, which can be used to route intrabuilding cabling.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
3. 
   Plenum
   Ple'num noun [ Latin , from plenus full.] That state in which every part of space is supposed to be full of matter; -- opposed to vacuum . G. Francis.
   Found op http://www.encyclo.co.uk/webster/P/106
   
   
4. 
   Plenum
   Ple'num noun (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.
   Found op http://www.encyclo.co.uk/webster/P/106
   
   
5. 
   plenum
   noun an enclosed space in which the air pressure is higher than outside
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=plenum
   
   
6. 
   plenum
   noun a meeting of a legislative body at which all members are present; `the plenum will vote on all tax increases`
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=plenum
   
   
7. 
   Plenum
   • (n.) 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. • (n.) That state in which every part of space is supposed to be full of matter; -- opposed to vacuum.
   Found op http://thinkexist.com/dictionary/meaning/plenum/
   
   
8. 
   Plenum
   The ceiling plenum is the volume defined by the area above the back of the ceiling tile, and below the bottom of the structural slab above. Within this plenum is usually found a combination of HVAC ducts, electrical and electronic conduits, water pipes, traditional masking sound speakers, etc
   Found op http://www.armstrong.com/commceilingsna/article22542.html
   
   
9. 
   Plenum
   - The main hot-air supply duct leading from a furnace.
   Found op http://www.homebuildingmanual.com/Glossary.htm
   
   
10. 
    Plenum
    The space between a hanging ceiling and the floor above or roof; usually contains HVAC ducts, electrical wiring, fire suppression system piping, etc.
    Found op http://www.electromn.com/glossary/p.htm
    
    
11. 
    plenum
    The space between a hanging ceiling and the floor above or roof; it usually contains HVAC ducts, electrical wiring, fire suppression system piping, etc.
    Found op http://www.daviddarling.info/encyclopedia/P/AE_plenum.html
    
    
12. 
    plenum
    1) 100 senators e.g. 2) Full assembly 3) Full legislative assembly 4) Meeting
    Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/plenum/1
    
    

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