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radiance

[rey-dee-uh ns] /ˈreɪ di əns/
noun
1.
radiant brightness or light:
the radiance of the tropical sun.
2.
warm, cheerful brightness:
the radiance of her expression.
3.
Rare. radiation.
Also, radiancy.
Origin
1595-1605
1595-1605; radi(ant) + -ance
Related forms
nonradiance, noun
subradiance, noun
superradiance, noun
Synonyms
1. resplendence, splendor, brilliance.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for superradiance

radiance

/ˈreɪdɪəns/
noun (pl) -ances, -ancies
1.
the quality or state of being radiant
2.
a measure of the amount of electromagnetic radiation leaving or arriving at a point on a surface. It is the radiant intensity in a given direction of a small element of surface area divided by the orthogonal projection of this area onto a plane at right angles to the direction Le
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 superradiance

radiance

n.

c.1600, "brilliant light," from radiant or else from Medieval Latin radiantia "brightness," from radiare "to beam, shine" (see radiation). Figurative use from 1761. Related: Radiancy.

Online Etymology Dictionary, © 2010 Douglas Harper
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superradiance in Medicine

radiance ra·di·ance (rā'dē-əns) or ra·di·an·cy (-ən-sē)
n.

  1. The quality or state of being radiant.

  2. The radiant energy emitted per unit time in a specified direction by a unit area of an emitting surface.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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