Definition of luminosity in English:


Line breaks: lu¦mi|nos¦ity
Pronunciation: /luːmɪˈnɒsəti

noun (plural luminosities)

[mass noun]
1Luminous quality: acrylic colours retain freshness and luminosity
More example sentences
  • So placed, the light sculpture's flickering luminosity seems to both recall an earlier contemplation and act as new illumination to a newer generation.
  • With the trappings of representation obliterated, the paintings offer a lean and stripped down physicality defined by specific proportion, luminosity and surface quality.
  • It hurtled through a void, an immense cathedral of black pitch, specked with faint pinpoints of light whose pale luminosity underscored the darkness that shrouded them.
1.1 Astronomy The intrinsic brightness of a celestial object (as distinct from its apparent brightness diminished by distance): Altair has ten times the luminosity of the sun [count noun]: the luminosities of galaxies
More example sentences
  • Stars, however, come in a staggering range of luminosities, spanning ten orders of magnitude ten powers of ten.
  • Stars of lower mass and luminosity, however, glow dimly with red light for billions of years: the redder the star is, the older it is.
  • Its luminosity will eventually become about a thousand times higher than today, and its vastly expanded diameter will reach the earth.
1.2 Physics The rate of emission of radiation, visible or otherwise.
More example sentences
  • The peak photon energy occurs at 10 keV and the total X-ray luminosity is 1045 ergs/sec.
  • Because of small body movements or maybe sudden changes in luminosity, some of the recorded emission spectra showed artifacts.
  • The first 15 photophase hours were at a 1000 lux luminosity and the last hour (simulating dusk) was at 25 lux luminosity.

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