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1. (n.) luminance
the state or quality of being luminous.
2. luminance
the quality or condition of radiating or reflecting light:
the blinding luminance of the sun.
3. luminance
the quantitative measure of brightness of a light source or an illuminated surface, equal to luminous flux per unit solid angle emitted per unit projected area of the source or surface.
Etymology: (1875–80; < L lūmin- (see lumen ) + -ance)
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| Definition of 'luminance' |
Princeton's WordNet |
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1. (noun) luminosity, brightness, brightness level, luminance, luminousness, light
the quality of being luminous; emitting or reflecting light
"its luminosity is measured relative to that of our sun"
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Definitions of luminance 
