Part of speech: noun

The quality of being luminous. luminousness.

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Usage examples "luminosity":

  1. Plated with some metallic substance that was itself a reservoir of luminosity and from which, it came to me, pulsed the force that lighted the winking ions. - "The Metal Monster", A. Merritt.
  2. At an altitude of 2, 150 feet the air- liner slid out over the Sea, the waters of which shone in the mid- afternoon sun with a peculiar luminosity. - "The Flying Legion", George Allan England.
  3. But the cold luminosity of jewels would have been extinguished to- night under this really terrific down- pour of light. - "The Sisters-In-Law", Gertrude Atherton.