Etymology
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brightness (n.)

Old English beorhtnes "brightness, clearness, splendor, beauty;" see bright + -ness.

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Definitions of brightness

brightness (n.)
the location of a visual perception along a continuum from black to white;
brightness (n.)
intelligence as manifested in being quick and witty;
Synonyms: cleverness / smartness
brightness (n.)
the quality of being luminous; emitting or reflecting light;
Synonyms: luminosity / brightness level / luminance / luminousness / light
From wordnet.princeton.edu