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1. (n.) absorptance
the ratio of the amount of radiation absorbed by a surface to the amount of radiation incident upon it.
Etymology: (1930–35)
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| Definition of 'absorptance' |
Princeton's WordNet |
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1. (noun) absorption coefficient, coefficient of absorption, absorptance
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"
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Definitions of absorptance 
