plural luminosities
Definition of luminosity
1a
: the quality or state of being luminous
b
: something luminous
2a
: the relative quantity of light
b
: relative brightness of something
3
: the relative quantity of radiation emitted by a celestial source (such as a star)
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Merriam-Webster unabridged
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Time Traveler for luminosity
The first known use of luminosity was in 1634
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