1. 
   absorptance
   Absorptance (a) is ratio of the radiant or luminous flux in a given spectral interval absorbed in a medium to that of the incident radiation. Also called absorption factor.
   Found op http://www.ktf-split.hr/periodni/en/abc/a.html
   
   
2. 
   Absorptance
   The ratio of the radiation absorbed by a surface to the total energy falling on that surface described as a percentage.
   Found op http://www.neo.ne.gov/statshtml/glossarya.htm
   
   
3. 
   Absorptance
   The ratio of solar energy absorbed by a surface to the solar energy striking it.
   Found op http://solarexpert.com/Glossary.html
   
   
4. 
   absorptance
   ratio of the absorbed radiant or luminous flux to the incident flux under specified conditions unit: 1
   Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=845-04-75
   
   
5. 
   absorptance
   The ratio of the luminous or radiant flux absorbed by a body to the flux falling on it. Absorptance is generally represented by the Greek letter a (alpha). By definition, in the case of a blackbody a = 1. Absorptance was formerly known as absorptivity.
   Found op http://www.daviddarling.info/encyclopedia/A/absorptance.html
   
   
6. 
   Absorptance
   The dissipation of light (radiation) within a surface or medium, caused by the conversion of radiant (luminous) energy to a different form of energy, usually heat, by interaction with matter. The absorption is the "missing piece", when comparing the total reflected and transmitted energy with the in...
   Found op http://www.intl-lighttech.com/support/glossary
   
   
7. 
   absorptance
   1) Absorption coefficient 2) Coefficient 3) Coefficient of absorption
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/absorptance/1
   
   

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