/ Dictionary / Index A absorption band: Meaning and Definition of Find definitions for: absorp'tion band" Pronunciation: [key] — Physics. Physics. a dark band in the absorption spectrum of a substance, corresponding to a range of wavelengths for which the substance absorbs more strongly than at adjacent wavelengths. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. absorption absorption coefficient 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