luminosity
nounUK /ˌluːmɪˈnɒsəti/
US /ˌluːmɪˈnɑːsəti/
Luminosity is how bright something is.
The luminosity of the stars made the night sky glow.
OTHER MEANINGS
2. The total amount of light a star gives off.
Scientists measured the star's luminosity to learn how big it is.
3. The quality of seeming clever or exciting.
The luminosity of her ideas impressed the whole class.
4. A bright, glowing appearance.
The luminosity of the sunset filled the sky with orange light.