Etymology

luminosity

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Today it means: the state of being luminous, or a luminous object; brilliance or radiance Full definition →

French luminosité
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The story

  1. French · borrowed fromluminosité
  2. English todayluminosity

Borrowed from French luminosité or else a native formation from luminous + -ity.

Etymology from Wiktionary, CC BY-SA 4.0.