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What does absorbance mean?

Looking for the meaning or definition of the word absorbance? Here's what it means.

Noun
  1. (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.]
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Examples
The term extinction coefficients describes the absorbance spectra of a single pure substance at known concentrations.
Upon measuring the absorbance of a labeled peptide at a given angle of incidence, two different dichroic ratios were obtained.
This signal at extended wavelengths outside of absorbance bands is characteristic of the dispersive part of differential light scattering.
The absorbance was measured with a microtiter plate reader at a test wavelength of 405 nm.
The isotropic emission spectra were normalized to the corresponding absorbance at the excitation wavelength.
The absorbance was always kept below 0.05 to avoid self-absorption of the fluorescence.

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