absorption coefficient(n = noun.quantity) absorptance, coefficient of absorption - 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"
is a kind of coefficient

absorption, absorption band, absorption factor, absorption indicator, absorption spectrum, absorption unit, biserial correlation coefficient, coefficient, coefficient of absorption, coefficient of concordance, coefficient of correlation, coefficient of drag, coefficient of elasticity, coefficient of expansion, coefficient of friction, coefficient of mutual induction, coefficient of reflection, coefficient of self induction, coefficient of viscosity, correlation coefficient, differential coefficient, drag coefficient, multiple correlation coefficient, pearson product-moment correlation coefficient, phi coefficient, product-moment correlation coefficient, rank-difference correlation coefficient, rank-order correlation coefficient, regression coefficient, tau coefficient of correlation, tetrachoric correlation coefficient