[light.ness] n (bef. 12c) 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 2, hue 2c, saturation
4.
[2]lightness n (12c) 1: the quality or state of being light esp. in weight
2: lack of seriousness and stability of character often accompanied by casual heedlessness 3 a: the quality or state of being nimble b: an ease and gaiety of style or manner
4: a lack of weightiness or force: delicacy