Definition of luminance noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈluːmɪnəns//
; NAmE NAmE//ˈluːmɪnəns//
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the amount of light given out in a particular direction from a particular area Word Origin late 19th cent. (as a general term meaning ‘light, brightness’): from Latin luminant- ‘illuminating’ (from the verb luminare) + -ance.
See the Oxford Advanced American Dictionary entry: luminance