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  1  definition  found 
 
  From  WordNet  r  1.6  [wn]: 
 
  absorptance 
  n  :  a  measure  of  the  rate  of  decrease  in  the  intensity  of 
  electromagnetic  radiation  (as  light)  as  it  passes  through 
  a  given  substance;  the  fraction  of  incident  radiant 
  energy  absorbed  per  unit  mass  or  thickness  of  an 
  absorber:  "absorptance  equals  1  minus  transmittance" 
  [syn:  {absorption  coefficient},  {coefficient  of 
  absorption}] 

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