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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.

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Definitions of radiance from WordNet

radiance (n.)
the amount of electromagnetic radiation leaving or arriving at a point on a surface;
Synonyms: glow / glowing
radiance (n.)
the quality of being bright and sending out rays of light;
Synonyms: radiancy / shine / effulgence / refulgence / refulgency
radiance (n.)
an attractive combination of good health and happiness;
the radiance of her countenance
From wordnet.princeton.edu