radiance — ONAD

radiance /ˈrādēəns, ˈreɪdiəns

▸ noun

1 light or heat as emitted or reflected by something:

the radiance of the sunset dwindled and died.

▪ great happiness, apparent in someone's expression or bearing:

the radiance of the bride's smile.

▪ a glowing quality of the skin, especially as indicative of good health or youth:

restore your skin's natural radiance.

2 Physics the flux of radiation emitted per unit solid angle in a given direction by a unit area of a source.