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- (physics) A logarithmic measure of the amount of light that is absorbed when passing through a substance; the capacity of a substance to absorb light of a given wavelength; optical density. [First attested in the mid 20th century.]
- ^ “absorbance” in Lesley Brown, editor-in-chief; William R. Trumble and Angus Stevenson, editors, The Shorter Oxford English Dictionary on Historical Principles, 5th edition, Oxford; New York, N.Y.: Oxford University Press, 2002, →ISBN, page 9.
absorbance f (plural absorbances)
- the fact of being absorbent