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

luminance

noun

/ˈluːmɪnəns/

/ˈluːmɪnəns/

[uncountable] (physics)

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the amount of light given out in a particular direction from a particular area
Word Originlate 19th cent. (as a general term meaning ‘light, brightness’): from Latin luminant- ‘illuminating’ (from the verb luminare) + -ance.

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adjective

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