from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics A measure of the absorption of
electromagnetic radiationas it passes through a specific substance; the fractionof incident radiation absorbedby unit massor unit thickness; absorptivity.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun 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
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