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illuminance

[ih-loo-muh-nuh ns] /ɪˈlu mə nəns/
noun, Optics.
1.
illumination (def 6).
Origin
1940-1945
1940-45; illumin(ate) + -ance
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for illuminance
  • illuminance alone does not consider the disabling glare that reduces visibility for the driver.
  • Different illuminance levels are required for different applications.
British Dictionary definitions for illuminance

illuminance

/ɪˈluːmɪnəns/
noun
1.
the luminous flux incident on unit area of a surface. It is measured in lux Ev Sometimes called illumination Compare irradiance
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
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illuminance in Science
illuminance
  (ĭ-l'mə-nəns)   
The luminous flux per unit area at any point on a surface exposed to incident light. It is measured in luxes. Also called illumination.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Difficulty index for illuminance

Few English speakers likely know this word

Word Value for illuminance

15
0
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