luminosity

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“
The few lights on the great boulevards are so dimmed that their luminosity is about that of a healthy firefly in June back home.

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Definitions (8)

Toggle American Heritage definitions American Heritage Dictionary (3)

  1. noun The condition or quality of being luminous.
  2. noun Something luminous.
  3. noun The ratio of luminous flux at a specific wavelength to the radiant flux at the same wavelength. Also called luminosity factor.

Toggle Century definitions Century Dictionary (3)

Toggle GNU Webster definitions GNU Webster's 1913 (1)

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Examples (50)

  • When the sun begins helium burning in earnest it will fall in luminosity, and Uranus will become a chilly 200 K. Moving inward to Saturn would work, for it will then be at 300 K, balmy shirtsleeve weather -- if we have arms by then. —  F ;SF; - vol 089 issue 01 - July 1995
  • How to explain thin filaments which glow by electron luminosity, a hundred times longer than they were wide? —  F ;SF - vol 089 issue 02 - August 1995
  • Solar luminosity is about two thousand times that of its G8 companion. —  WorldsEnough ;Time
  • It was a luminosity, the edges of which were not too sharply defined. —  152 - The Thing That Pursued
  • At times he thought a faint luminosity was apparent deep in the jade-colored depth, but he could not be sure. —  Conan -- The Stories from Weird Tales (1932-1936)
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Roget's II Roget's II: The New Thesaurus

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Roget's II: The New Thesaurus, Third Edition by the Editors of the American Heritage® Dictionary. Copyright © 2003, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Etymologies (1)

Toggle Century etymologies Century Dictionary (1)

  1. = French luminosité = Italian luminosità, from Middle Latin luminosita(t-)s, splendor, from Latin luminosus, luminous: see luminous.
 

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/ljumɪˈnɑsəti/
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