illuminance

[ih-loo-muh-nuh ns]

noun Optics.


Nearby words

  1. illogicality,
  2. illth,
  3. illude,
  4. illume,
  5. illuminable,
  6. illuminant,
  7. illuminate,
  8. illuminated,
  9. illuminati,
  10. illuminating

Origin of illuminance

First recorded in 1940–45; illumin(ate) + -ance

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019


British Dictionary definitions for illuminance

illuminance

noun

the luminous flux incident on unit area of a surface. It is measured in luxSymbol: E v 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

Science definitions for illuminance

illuminance

[ĭ-lōōmə-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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.