irradiance

[ih-rey-dee-uhns]

ir·ra·di·ance

[ih-rey-dee-uhns]
noun Physics.
incident flux of radiant energy per unit area.


Origin:
1660–70; ir-1 + radiance
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Irradiance is always a great word to know.
So is radiation. Does it mean:
the process in which energy is emitted as particles or waves, transmitted through an intervening medium or space, and absorbed by another body
radiation consisting of electromagnetic waves, including radio waves, infrared, visible light, ultraviolet, x-rays, and gamma rays
Collins
World English Dictionary
irradiance (ɪˈreɪdɪəns)
 
n
Compare illuminance Ee, Also called: irradiation the radiant flux incident on unit area of a surface. It is measured in watts per square metre

Collins English Dictionary - Complete & Unabridged 10th Edition
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