absorbance absorbable • absorbate · · · Info · Definitions · Synonyms · Characters · · absorbance · · Text Latin · · Script 10 · · Length 3 · · Syllables Definitions · · · (noun) (physics) a measure of the extent to which a substance transmits light or other electromagnetic radiation. Synonyms: optical density, transmission density, photographic density. · · Noun Definition 1 Synonyms · · · optical density · · Synonym 1 transmission density · · Synonym 2 photographic density · · Synonym 3 Characters · · a latin small letter a U+0061 b latin small letter b U+0062 c latin small letter c U+0063 e latin small letter e U+0065 n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073