/ Dictionary / Index A absorption coefficient: Meaning and Definition of Find definitions for: absorp'tion coeffi"cient Pronunciation: [key] — Physics, Optics. Physics,Optics. a measure of the rate of decrease in the intensity of electromagnetic radiation, as light, as it passes through a given substance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. absorption band absorption dynamometer Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language