absorption coefficient

Pronunciation:			ab'sorpshun `kowu'fishunt
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WordNet Dictionary
	Definition:		[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"
	Synonyms:		absorptance, coefficient of absorption
	See Also:		coefficient