noun
the state or quality of being bright to the utmost degree
adjective
describing the highest level of brightness
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The concept of absolute brightness refers to the actual brightness of a celestial object, unaffected by distance or any other factors.
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The absolute brightness of that star is mind-blowing, it's so bright you can see it from miles away!
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Dude, that car's headlights have absolute brightness, they're blinding everyone on the road!
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Her smile had an absolute brightness that lit up the entire room, making everyone feel happy and at ease.