ABSORPTANCE
\ɐbsˈɔːptəns], \ɐbsˈɔːptəns], \ɐ_b_s_ˈɔː_p_t_ə_n_s]\
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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
