2 definitions found
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Radiation \Ra`di*a"tion\, n. [L. radiatio: cf F. radiation.]
1. The act of radiating, or the state of being radiated;
emission and diffusion of rays of light; beamy brightness.
2. The shooting forth of anything from a point or surface,
like the diverging rays of light; as the radiation of
heat.
From WordNet r 1.6 [wn]:
radiation
n 1: the physical phenomenon of radiating energy in the form of
waves or particles
2: the act of radiating
more about radiation
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