radiant brightness or light: the radiance of the tropical sun.
warm, cheerful brightness: the radiance of her expression.
Rare. radiation.
Also, radiancy.

1595–1605; radi(ant) + -ance

nonradiance, noun
subradiance, noun
superradiance, noun

1. resplendence, splendor, brilliance. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
radiance or radiancy (ˈreɪdɪəns)
n , pl -ances, -ancies
1.  the quality or state of being radiant
2.  Le 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
radiancy or radiancy

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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

  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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