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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use brightness in a sentence
According to Donahue, an ideal goal would be to reduce the brightness of these satellites by a factor of 100.Satellite mega-constellations risk ruining astronomy forever | Neel Patel | September 2, 2020 | MIT Technology Review
SpaceX tested out a prototype “DarkSat” paint on a Starlink satellite in January, but it failed to significantly reduce brightness.Satellite mega-constellations risk ruining astronomy forever | Neel Patel | September 2, 2020 | MIT Technology Review
A remote control helps you adjust the brightness and set a timer for turning the lights on and off.
Astronomers seek out potential exoplanets by looking for fluctuations in the brightness of distant stars.50 new planets, including one as big as Neptune, are identified using A.I. | rhhackettfortune | August 26, 2020 | Fortune
The fields are weak and the brightness of the sun outshines its corona.Check out the first-ever map of the solar corona’s magnetic field | Lisa Grossman | August 21, 2020 | Science News
Hop in bed with your iPad or iPhone and turn the brightness all the way up.
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. | Daniel Gross | December 4, 2013 | THE DAILY BEAST
Cider boasts acidity and (generally) effervescence, both of which cleanse the palate and add brightness and lift to rich dishes.
But it gave the video a particular look—a particular brightness for the colors.
Viewers may need to lower screen brightness or don some sunglasses.Robin Thicke, Jay Z & More Best Music Videos of the Week (VIDEO) | Victoria Kezra | August 31, 2013 | THE DAILY BEAST
The poor must look to the brightness of a future world for the consolation that they were denied in this.The Unsolved Riddle of Social Justice | Stephen Leacock
Robert's going had some way taken the brightness, the color, the meaning out of everything.The Awakening and Selected Short Stories | Kate Chopin
Sickness had never blanched the warm glow on her cheeks, or dimmed the brightness of her large, lustrous eyes.The World Before Them | Susanna Moodie
I met him on Kingstown promenade the other day walking with an elastic step and with the brightness of youth in his eye.Fifty Years of Railway Life in England, Scotland and Ireland | Joseph Tatlow
It was a golden day, almost incredibly clear and radiant, quivering with brightness and life, and surely with ecstasy.Bella Donna | Robert Hichens
British Dictionary definitions for brightness
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