luminosity - Definitions from Dictionary.com

4 results for: luminosity

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

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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

The condition or quality of being luminous.
Something luminous.
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.
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