brightness
Definitions
The quality or state of giving out or reflecting a large amount of light.
The degree of intensity or vividness of a color.
A quality of intelligence, quick-wittedness, or mental sharpness.
Examples
The brightness of the sun made it difficult to keep my eyes open.
You can adjust the screen brightness in the settings menu.
Her intelligence and brightness were evident to everyone who met her.
Synonyms
luminosity radiance brilliance glow vividness clarity intensity