Definition of luminosity
1a : the quality or state of being luminousb : something luminous
2a : the relative quantity of lightb : relative brightness of something
3 : the relative quantity of radiation emitted by a celestial source (such as a star)
Examples of luminosity in a Sentence
the luminosity of the fireflies made for an enchanting nighttime show
Recent Examples of luminosity from the Web
For lower-key radiance, GlamGlow Glowstarter Mega Illuminating Moisturizer in Sun Glow ($49) gives your face the right balance of warmth and luminosity.
The machine would then use the smartphone camera to measure the luminosity of the sample and determine whether the flu was present.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'luminosity'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use of luminosity
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