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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 of irradiance
1660-1670
1660-70; ir-1 + radiance
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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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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