Rā'di-ā'tion, n.

n. [Lat. radiatio, Fr. radiation, Sp. radiacion, It. radiazione.]

1. The act of radiating, or the state of being radiated; emission and diffusion of rays of light; beamy brightness.
2. The divergence or shooting forth of any thing from a point or surface, like the diverging rays of light; as, the radiation of heat.