- 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.
Origin of brightness
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for brightness
Hop in bed with your iPad or iPhone and turn the brightness all the way up.Body Hack: How to See in the Dark (Like Pirates!)
December 10, 2013
Consumer Reports last month actually ran one for 25,000 hours straight and it still maintained its brightness.Why You Should Give LED Light Bulbs for Christmas. Seriously.
December 4, 2013
Specifically, the law said a bulb should provide 100 watts of brightness while using 72 watts or less.The Best Green Idea in Obama’s Climate-Change Speech
June 25, 2013
The champagne brings out the brightness and tang of the grapefruit.What to Eat
August 11, 2009
It was poignant because with her brightness and her zest for life, she is also dealing with something very dark.The Queen of Queens
March 16, 2009
Do you observe this red glow,—dusky, too, amid all the brightness?Other Tales and Sketches
This flash of gold is the only brightness in the place, otherwise dull and monotonous.The Roof of France
It seemed to them as if the brightness of the moon had been increased, and was as resplendent as that of the sun.The Dream
But there is a light, above the brightness of the sun, shining round about her.Slavery Ordained of God
Rev. Fred A. Ross, D.D.
Somehow the brightness had gone from the day—he knew not why.Gloria and Treeless Street
Annie Hamilton Donnell
- the condition of being bright
- physics a former name for luminosity (def. 4)
- psychol the experienced intensity of light
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
Word Origin and History for brightness
Online Etymology Dictionary, © 2010 Douglas Harper