Definition of radiation:

part of speech: noun

Act of radiating: the emission and diffusion of rays of light or heat.

part of speech: noun

The coming forth and spreading, as of rays, in all directions from a common center; as, the radiation of light or heat from a shining or heated body.

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The act of separating; the thing separated; a body of troops, or certain ships, separated from the main body and sent on special service. ...