1. (

• brightness

) the location of a visual perception along a continuum from black to white ;

2. (

• brightness ,
• cleverness ,
• smartness ,

) intelligence as manifested in being quick and witty ;

3. (

• 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" ;