[ rey-dee-uhns ]
/ ˈreɪ di əns /


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

Origin of radiance

First recorded in 1595–1605; radi(ant) + -ance


non·ra·di·ance, nounsub·ra·di·ance, nounsu·per·ra·di·ance, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for radiance

British Dictionary definitions for radiance



/ (ˈreɪdɪəns) /

noun plural -ances or -ancies

the quality or state of being radiant
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 directionSymbol: L e
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

Medical definitions for radiance

[ rādē-əns ]


The quality or state of being radiant.
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.