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[brahyt-nis] /ˈbraɪt nɪs/
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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for brightness
Contemporary Examples
Historical Examples
  • Nevertheless, when Zebedee arrived on the moor, her brightness faded.

    Moor Fires E. H. (Emily Hilda) Young
  • 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 Emile Zola
  • By degrees, she seemed to absorb all her companion's life and brightness.

    Old Kensington Miss Thackeray
  • 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.
  • Her complexion was very bright, but in spite of its brightness she never blushed.

    Phineas Finn Anthony Trollope
British Dictionary definitions for brightness


the condition of being bright
(physics) a former name for luminosity (sense 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
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Word Origin and History for brightness

Old English beorhtnes "brightness, clearness, splendor, beauty;" see bright + -ness.

Online Etymology Dictionary, © 2010 Douglas Harper
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brightness in Technology

(Or "tone", "luminance", "value", "luminosity", "lightness") The coordinate in the HSB colour model that determines the total amount of light in the colour. Zero brightness is black and 100% is white, intermediate values are "light" or "dark" colours.
The other coordinates are hue and saturation.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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