Radiant has multiple meanings depending on the context. Here are some of the definitions:

• Emitting light or heat: Radiant can describe something that emits or seems to emit rays of light or heat. For example, the sun is a radiant source of light and heat.

• Expressing happiness or beauty: Radiant can also describe someone who is glowing with happiness or beauty. For instance, a bride might look radiant on her wedding day.

• Transmitted by radiation: In science, radiant means "transmitted by radiation," and it usually describes heat, like the radiant heat from an oven.

• A form of energy: Radiant energy is a form of electromagnetic radiation that includes visible light, ultraviolet light, and infrared radiation.

• A point or object that emits radiation: In physics, a radiant is a point or object that emits radiation, such as the part of a heater that gives out heat.

In summary, radiant can refer to something that emits light or heat, expresses happiness or beauty, is transmitted by radiation, or is a form of energy.