Meaning of BRIGHTNESS in English

BRIGHTNESS

/bruyt"nis/ , n.

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.

[ bef. 950; ME brihtnes, OE beorhtnes. See BRIGHT, -NESS ]

Random House Webster's Unabridged English dictionary.      Полный английский словарь Вебстер - Random House .