[ brahyt-nis ]
See synonyms for brightness on
  1. the quality of being bright.

  2. 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

Words Nearby brightness Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use brightness in a sentence

British Dictionary definitions for brightness


/ (ˈbraɪtnɪs) /

  1. the condition of being bright

  2. physics a former name for luminosity (def. 4)

  1. 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