1) N-UNCOUNT The luminosity of a star or sun is how bright it is. [TECHNICAL]

For a few years its luminosity flared up to about 10,000 times the present-day luminosity of the Sun.

2) N-UNCOUNT You can talk about the luminosity of someone's skin when it has a healthy glow.

Ultrafine powder with a rosy tinge gives the skin warmth and luminosity.

English dictionary. 2008.

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