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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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British Dictionary definitions for self-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 self-luminosity

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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