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Definition of 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.

Synonyms:

dissipation, fallout, radiation syndrome, actinotherapy, radioactivity, circulation, shaft, spread, radiation sickness, beam of light, radiation therapy, emission, transmission, divarication, ray, pollution, shaft of light, irradiation, ramification, broadcast, propagation, radiotherapy, ray of light, light beam, X-rays.

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