noun Date: before 12th century 1. the quality or state of being bright, luminance , the attribute of light-source colors by which emitted light is ordered continuously from light to dark in correlation with its intensity
BRIGHTNESS
Meaning of BRIGHTNESS in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012