Collins COBUILD Advanced Learner's English Dictionary - luminosity

1. 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. N-UNCOUNT 2. 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. N-UNCOUNT