noun

brightness

brightness, luminosity, vividness, cleverness

The brightness of the sun hurt my eyes.

The brightness of the sun hurt my eyes.

You can adjust the screen brightness.

You can adjust the screen brightness.

Her brightness was evident in her quick answers.

Her brightness was evident in her quick answers.

the brightness of ((sth.)) the quality of being bright of (sth.) The brightness of the stars was amazing.

Synonyms: luminosity, brilliance; Antonyms: darkness, dimness

From the adjective 'bright' plus the noun-forming suffix '-ness'.

Think of adjusting the 'brightness' on your phone screen.

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