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illuminance

[ih-loo-muh-nuh ns]
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noun Optics.
  1. illumination(def 6).
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Origin of illuminance

First recorded in 1940–45; illumin(ate) + -ance
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for illuminance

illuminance

noun
  1. the luminous flux incident on unit area of a surface. It is measured in luxSymbol: E v Sometimes called: illumination Compare irradiance
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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

illuminance in Science

illuminance

[ĭ-lōōmə-nəns]
  1. The luminous flux per unit area at any point on a surface exposed to incident light. It is measured in luxes. Also called illumination
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.