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light·ness | \ ˈlīt-nəs 
\
\Definition of lightness
(Entry 1 of 2)
1 : the quality or state of being illuminated : illumination
2 : the attribute of object colors by which the object appears to reflect or transmit more or less of the incident light — compare brightness sense 2, hue sense 2c, saturation sense 4
lightness
noun (2)Definition of lightness (Entry 2 of 2)
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The first known use of lightness was before the 12th century
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