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irradiance

[ih-rey-dee-uh ns] /ɪˈreɪ di əns/
noun, Physics.
1.
incident flux of radiant energy per unit area.
Also, irradiation.
Origin
1660-1670
1660-70; ir-1 + radiance
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for irradiance
  • The amount of solar irradiance has not changed at the bottom of the atmosphere.
  • It is called the total solar irradiance and it has not moved upwards in decades and has in fact declined slightly.
  • The power of heat input during the day depends on local albedo and the sine of the angle of the incident solar irradiance.
  • Beam irradiance, and not merely total power, is everything.
  • Color is simpy the product of the spectral irradiance of the object and the spectral sensitivity of our eye.
British Dictionary definitions for irradiance

irradiance

/ɪˈreɪdɪəns/
noun
1.
the radiant flux incident on unit area of a surface. It is measured in watts per square metre Ee Also called irradiation Compare illuminance
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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Word Origin and History for irradiance
adj.

1660s, from irradiant (1520s), from Latin irradiantem (nominative irradians), present participle of irradiare (see irradiate). Related: Irradiancy (1640s).

Online Etymology Dictionary, © 2010 Douglas Harper
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