Brightness
WordNet
noun
(1) The location of a visual perception along a continuum from black to white
(2) The quality of being luminous; emitting or reflecting light
"Its luminosity is measured relative to that of our sun"
(3) Intelligence as manifested in being quick and witty
WiktionaryText
Noun
- the quality of being bright
- the perception elicited by the luminance of an object
- intelligence, cleverness