"luminousness," 1862, from Late Latin luminantem (nominative luminans), present participle of luminare "to shine," from Latin lumen (genitive luminis) "light," from suffixed form of PIE root *leuk- "light, brightness." Related: Luminant.
lumen
Lumiere
luminaire
luminal
Luminal
luminance
luminary
luminate
luminescence
luminescent
luminosity
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