Found 2 items, similar to luminousness.
English → English (WordNet) Definition: luminousness luminousness n : the quality of being luminous; emitting or reflecting light; “its luminosity is measured relative to that of our sun” [syn: luminosity, brightness, brightness level, luminance, light]
English → English (gcide) Definition: luminousness luminousness \lu"mi*nous*ness\ n. the quality of being luminous; emitting or reflecting light. Syn: luminosity, luminance, light. [WordNet 1.5]