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noun, plural lu·mi·nos·i·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.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Luminosity
is always a great word to know.
So is pulsar. Does it mean:
| a zodiacal constellation between Scorpius and Capricorn also called the Archer |
| one of several hundred known celestial objects, generally believed to be rapidly rotating neutron stars, that emit pulses of radiation such as radio waves with a high degree of regularity |
Collins
World English Dictionary
| luminosity (ˌluːmɪˈnɒsɪtɪ) | |
| —n , 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 See also colour Former name: brightness the attribute of an object or colour enabling the extent to which an object emits light to be observed |
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History
luminosity
1630s, "quality of being luminous," from luminous. In astronomy sense of "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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