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- Dictionaryra·di·a·tion/ˌrādēˈāSH(ə)n/
noun
- 1. the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles which cause ionization.
- 2. divergence out from a central point, in particular evolution from an ancestral animal or plant group into a variety of new forms: "evolution is a process of radiation not progression"
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