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Noun brightness has 3 senses
  1. brightness - the location of a visual perception along the black-to-white continuum
    --1 is a kind of     light, lightness
    Antonyms: dullness, dulness
    --1 has particulars:
     glare, blaze, brilliance; dazzle; glitter, glister, glisten, scintillation, sparkle; flash; glint; opalescence, iridescence; radiance, radiancy, shine, effulgence, refulgence, refulgency; luster, lustre, brilliancy, splendor, splendour
  2. brightness, cleverness, smartness - intelligence as manifested in being quick and witty
    --2 is a kind of intelligence
  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"
    --3 is a kind of physical property
    --3 has particulars:
     illuminance, illumination; incandescence; luminescence, glow
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