noun, plural lu·mi·nos·i·ties.
the quality of being intellectually brilliant, enlightened, inspired, etc.: The luminosity of his poetry is unequaled.
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.
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 of luminosity
1625–35;Related formsnon·lu·mi·nos·i·ty, nounself-lu·mi·nos·i·ty, noun
< Latin lūminōs(us
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for luminosity
Contemporary Examples of luminosity
Historical Examples of luminosity
It is the radiations of light which they throw off; it is their luminosity—their transparency.
There was luminosity where the ships had encountered each other.
Value or luminosity of colors ranges between these two extremes.
But this luminosity is not entirely confined to the minute creatures of the sea.
He nodded toward the circular area of luminosity on the sea.
British Dictionary definitions for luminosity
noun plural -ties
the condition of being luminous
something that is luminous
astronomy a measure of the radiant power emitted by a star
physics the attribute of an object or colour enabling the extent to which an object emits light to be observedFormer name: brightness See also colour
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for luminosity
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