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- DictionaryLu·mi·nos·i·ty/ˌlo͞oməˈnäsədē/
noun
- 1. luminous quality: "acrylic colors retain freshness and luminosity"
noun
Luminosity is an absolute measure of radiated electromagnetic energy per unit time, and is synonymous with the radiant power emitted by a light-emitting object. In astronomy, luminosity is the total amount of electromagnetic energy emitted per unit of time by a star, galaxy, or other astronomical objects. Wikipedia