luminosity

Meanings

Plural: luminosities

Noun

• the quality of being luminous; emitting or reflecting light
  • "its luminosity is measured relative to that of our sun"
• the state of being luminous, or a luminous object; brilliance or radiance
• the ratio of luminous flux to radiant flux at the same wavelength; the luminosity factor
• The rate at which a star radiates energy in all directions.

Synonyms

brightness, brightness level, light, luminance, luminousness