ABSORPTION COEFFICIENT
\ɐbsˈɔːpʃən kˌə͡ʊɪfˈɪʃənt], \ɐbsˈɔːpʃən kˌəʊɪfˈɪʃənt], \ɐ_b_s_ˈɔː_p_ʃ_ə_n k_ˌəʊ_ɪ_f_ˈɪ_ʃ_ə_n_t]\
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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"
By Princeton University
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A term used to indicate the amount of gas absorbed by a definite volume (1 cc.) of liquid (water) at a given temperature and barometric pressure, a. lines. Narrow bands on lines in spectrum when light is absorbed after passing through certain liquids or vapors.
By Smith Ely Jelliffe
