radiation Definition
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radiation
noun
- 1. Energy (usually electromagnetic radiation, eg radio waves, microwaves, infrared, visible light, ultraviolet, X-rays) that is emitted from a source and travels in the form of waves or particles (photons) through a medium, eg air or a vacuum.
2. A stream of particles, eg alpha particles, beta particles, electrons, neutrons, etc, emitted by a radioactive substance.
3. The act or process of radiating.
