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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Irradiance  \Ir*ra"di*ance\,  Irradiancy  \Ir*ra"di*an*cy\,  n. 
  [From  {Irradiant}.] 
  1.  The  act  of  irradiating;  emission  of  rays  of  light. 
  2.  That  which  irradiates  or  is  irradiated;  luster;  splendor; 
  irradiation;  brilliancy.  --Milton.