luminosity
Definitions
The intrinsic brightness of a celestial object, measured as the total amount of energy emitted per unit of time.
The quality or state of being luminous; brightness or radiance.
A measure of the perceived brightness of a light source.
Examples
The astronomer measured the luminosity of the distant star to determine its age.
The moon's soft luminosity cast a gentle glow over the quiet garden.
Synonyms
brightness brilliance radiance glow incandescence luminousness lustre