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[loo-muh-nos-i-tee] /ˌlu məˈnɒs ɪ ti/
noun, plural luminosities.
luminance (def 2).
the quality of being intellectually brilliant, enlightened, inspired, etc.:
The luminosity of his poetry is unequaled.
something luminous.
Astronomy. 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.
Also called luminosity factor. Optics. the 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.
Origin of luminosity
1625-35; < Latin lūminōs(us) luminous + -ity
Related forms
nonluminosity, noun
self-luminosity, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for luminosity
  • But a close look at this upward escaping luminosity can reveal cultural clues about the polluters.
  • Look where you will, you shall find the producer acquiring what luminosity he can, that the product may thence take profit.
  • And that should be enough, since luminosity and temperature are related.
  • The luminosity of the immediate moment is framed, if not altogether blotted out, by the shadows of past and future.
  • His skies are rarely distinctly blue, as if this color would opacify their luminosity.
  • They convey the same loneliness, timelessness and quietude of his more famous canvases, and are rendered with the same luminosity.
  • The second is its luminosity, or the number of collisions per second.
  • When viewed edge-on, spiral galaxies' apparent luminosity is reduced since the entire disk appears to be non-luminous.
  • And the last several years, we're seeing another technology that prizes these same qualities of easy correction and luminosity.
  • Only days later, when the comet had returned to its normal luminosity, did they see fragments in the object's tail.
British Dictionary definitions for luminosity


noun (pl) -ties
the condition of being luminous
something that is luminous
(astronomy) a measure of the radiant power emitted by a star
(physics) the attribute of an object or colour enabling the extent to which an object emits light to be observed Former name brightness See also colour
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for luminosity

1630s, "quality of being luminous," from French luminosité or else a native formation from luminous + -ity. In astronomy, "intrinsic brightness of a heavenly body" (as distinguished from apparent magnitude, which diminishes with distance), attested from 1906.

Online Etymology Dictionary, © 2010 Douglas Harper
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