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Meaning of luminosity

lu•mi•nos•i•ty

Pronunciation: (l"mu-nos'i-tē), [key]
— pl. -ties.
  1. luminance (def. 2).
  2. the quality of being intellectually brilliant, enlightened, inspired, etc.: The luminosity of his poetry is unequaled.
  3. something luminous.
  4. the brightness of a star in comparison with that of the sun: the luminosity of Sirius expressed as 23 indicates an intrinsic brightness 23 times as great as that of the sun.
  5. Also calledthe brightness of a light source of a certain wavelength as it appears to the eye, measured as the ratio of luminous flux to radiant flux at that wavelength.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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