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What is a luminosity?

What is a luminosity? Here are some definitions.

Noun
  1. (uncountable) the state of being luminous, or a luminous object; brilliance or radiance
  2. (physics) the ratio of luminous flux to radiant flux at the same wavelength; the luminosity factor
  3. (astronomy) the rate at which a star radiates energy in all directions
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Examples
The director's visual style, one that incorporates a great deal of light and luminosity, tends to fade the picture.
In The Approach, a mostly white painting with edges of yellow-gold, a mystical luminosity is supported by a gnomic title.
In the transparency of watercolor, the thin veils of color lapping the underlying white paper capture the city's luminosity.
On returning to England he adopted a lighter palette and a white ground for greater luminosity.
There was a general feeling of relief when we saw the sky lit up with a red luminosity and we knew it was the lights of our city ahead.
Snow, at a modest 30 by 32 inches, stood out in this exhibition for the luminosity of its light palette and relatively open structure.

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