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luminosity

[loo-muh-nos-i-tee] /ˌlu məˈnɒs ɪ ti/
noun, plural luminosities.
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.
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.
5.
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
1625-1635
1625-35; < Latin lūminōs(us) luminous + -ity
Related forms
nonluminosity, noun
self-luminosity, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples 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

luminosity

/ˌluːmɪˈnɒsɪtɪ/
noun (pl) -ties
1.
the condition of being luminous
2.
something that is luminous
3.
(astronomy) a measure of the radiant power emitted by a star
4.
(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
n.

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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