luminosity

plural luminosities

1. uncountablethe state of being luminous, or a luminous object; brilliance or radiance

   They reported encountering a luminosity of great intensity and loving angelic beings.

   1994, Simcha Paull Raphael, Jewish Views of the Afterlife, page 360

2. countableuncountablenatural sciencesthe ratio of luminous flux to radiant flux at the same wavelength; the luminosity factor
3. countableuncountableastronomyThe rate at which a star radiates energy in all directions.

   We recognize the same pattern as in the left panel, with dM stars being much less frequent flarers than dMe stars of similar luminosity.

   2012, O. Havnes, B. R. Pettersen, J. H. M. M. Schmitt, Activity in Cool Star Envelopes: Proceedings, page 56

   1 more example

   We derive rotation periods, photometric activity indices, flaring energies, mass loss rates, gyrochronological ages, X-ray luminosities and consider implications for the planetary magnetospheres and habitability.

   2015, D. J. Armstrong, C. E. Pugh, A.-M. Broomhall, D. J. A. Brown, M. N. Lund, H. P. Osborn, D. L. Pollacco, “The Host Stars of Keplers Habitable Exoplanets: Superflares, Rotation and Activity”, in arXiv