Definition of "radiation" in English

noun

1. The shooting forth of anything from a point or surface, like diverging rays of light.

   • The radiation of love from the crowd was addictive to the young singer-songwriters.

2. The process of radiating waves or particles.

3. The transfer of energy via radiation.

4. Radioactive energy.

5. (evolutionary theory, countable) A rapid diversification of an ancestral species into many new forms.