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
Source: WordNetabsorptance equals 1 minus transmittance Source: Internet
F. and Huffman, D.R. "Absorption and Scattering of Light by Small Particles", Wiley, (1983), ISBN 0-471-29340-7 Ultrasound propagation through homogeneous media is associated only with absorption and can be characterized with absorption coefficient only. Source: Internet
Polarized light main seeAlso The second meaning of dichroic refers to a material in which light in different polarization states traveling through it experiences a different absorption coefficient. Source: Internet