the quality of being bright.
Optics. the luminance of a body, apart from its hue or saturation, that an observer uses to determine the comparative luminance of another body. Pure white has the maximum brightness, and pure black the minimum brightness.
Contemporary Examples

Why You Should Give LED Light Bulbs for Christmas. Seriously. Daniel Gross December 3, 2013
What to Eat August 10, 2009
The Queen of Queens Rachel Syme March 15, 2009
The Best Green Idea in Obama’s Climate-Change Speech Daniel Gross June 24, 2013
Body Hack: How to See in the Dark (Like Pirates!) Brian Ries December 9, 2013

Historical Examples

Moor Fires E. H. (Emily Hilda) Young
The Dream Emile Zola
Old Kensington Miss Thackeray
Slavery Ordained of God Rev. Fred A. Ross, D.D.
Phineas Finn Anthony Trollope

the condition of being bright
(physics) a former name for luminosity (sense 4)
(psychol) the experienced intensity of light


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