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reflectance

[ri-flek-tuh ns]
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noun Physics, Optics.
  1. the ratio of the intensity of reflected radiation to that of the radiation incident on a surface.
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Compare albedo.

Origin of reflectance

First recorded in 1925–30; reflect + -ance
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for reflectance

reflectance

reflection factor

noun
  1. a measure of the ability of a surface to reflect light or other electromagnetic radiation, equal to the ratio of the reflected flux to the incident fluxSymbol: ρ Compare transmittance, absorptance
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012