brightness

[ brahyt-nis ]
/ ˈbraɪt nɪs /

noun

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

before 950; Middle English brihtnes, Old English beorhtnes. See bright, -ness
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for brightness

British Dictionary definitions for brightness

brightness

/ (ˈbraɪtnɪs) /

noun

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