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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This
lu·mi·nos·i·ty    Audio Help   [loo-muh-nos-i-tee] Pronunciation Key
–noun, plural -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.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: 1625–35; < L lūminōs(us) luminous + -ity]
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
Encyclopædia Britannica, Inc.
luminosity

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American Heritage Dictionary - Cite This Source - Share This
lu·mi·nos·i·ty    Audio Help   (lōō'mə-nŏs'ĭ-tē)  Pronunciation Key 
n.   pl. lu·mi·nos·i·ties
  1. The condition or quality of being luminous.
  2. Something luminous.
  3. The ratio of luminous flux at a specific wavelength to the radiant flux at the same wavelength. Also called luminosity factor.

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
WordNet - Cite This Source - Share This
luminosity

noun
the quality of being luminous; emitting or reflecting light; "its luminosity is measured relative to that of our sun" 

WordNet® 3.0, © 2006 by Princeton University.
Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Luminosity

Lu`mi*nos"i*ty\, n. The quality or state of being luminous; luminousness.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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