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n 1 a  :  the radiation of a physiologically active agent from a point of origin within the body : esp  :  the spread of a nervous impulse beyond the usual conduction path  b  :  apparent enlargement of a light or bright object or surface when displayed against a dark background  2 a  :  exposure to radiation (as ultraviolet light, X rays, or alpha particles)  b  :  application of radiation (as X rays or gamma rays) esp. for therapeutic purposes  3  :  IRRADIANCE .
Similar sounding terms:  ir·ri·ta·tion 

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