/ Dictionary / Index A absorbance: Meaning and Definition of Find definitions for: ab•sorb•ance Pronunciation: (ab-sôr'buns, -zôr'-), [key] — n. Physics. the capacity of a substance to absorb radiation, expressed as the common logarithm of the reciprocal of the transmittance of the substance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: absorbance (Thesaurus) absorb absorbed Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language