Where does the word radiance originate from?

The Word "radiance" originates from the Latin term "radiantia," which means "to shine" or "to emit rays." This, in turn, is derived from "radius," meaning "ray" or "spoke," reflecting the concept of light or energy radiating outward. The term has evolved in English to denote both light and brightness, often in a metaphorical sense to describe a person's aura or presence.