radiation
noun
[ reɪdɪˈeɪʃ(ə)n ]
• the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles which cause ionization.
• 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"
Origin:
late Middle English (denoting the action of sending out rays of light): from Latin radiatio(n- ), from radiare ‘emit rays’ (see radiate).
