
(A, D, E) optical density; extinction; decadic absorbance. A measure of the amount of light absorbed by a sample. The absorbance (A) equals minus the base-10 log of the transmittance.
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http://antoine.frostburg.edu/chem/senese/101/glossary/a.shtml

In spectroscopy, the absorbance (also called optical density) of a material is a logarithmic ratio of the radiation falling upon a material, to the radiation transmitted through a material. Absorbance measurements are often carried out in analytical chemistry. In physics, the term spectral `absorbance is used interchangeably with ``spectral `...
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http://en.wikipedia.org/wiki/Absorbance

1. <chemistry, investigation> Absorbance is defined as a logarithmic function of the percent transmission of a wavelength of light through a liquid. ... 2. <microbiology> This can be used as a measure of the amount of light absorbed by a suspension of bacterial cells or a solution of an organic molecule, it is measured by a colourimeter...
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http://www.encyclo.co.uk/local/20973

(ab-sor´bәns) in radiology, a measure of the ability of a medium to absorb radiation, expressed as the logarithm of the quotient of the intensity of the radiation entering the medium divided by that leaving it. Called also optical density.
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http://www.encyclo.co.uk/local/21001
(A, A) Type: Term Pronunciation: ab-sōr′bants Definitions: 1. spectrophotometry log of the ratio of the radiant power of the incident radiation to the radiant power of the transmitted radiation. Synonyms: absorbancy, absorbency, extinction2, optic density
Found on
http://www.medilexicon.com/medicaldictionary.php?t=303

when a molecule captures energy from a photon and vibrates or stretches, using the energy
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https://courses.lumenlearning.com/microbiology/chapter/glossary/

the capacity of a substance to absorb radiation, expressed as the common logarithm of the reciprocal of the transmittance of the substance.
Found on
https://www.infoplease.com/dictionary/absorbance
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