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radiation

Syllabification: (ra·di·a·tion)
Pronunciation: /ˌrādēˈāSHən/

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Definition of radiation

noun

  • 1 Physics the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles that cause ionization.
  • the energy transmitted by radiation, as heat, light, electricity, etc..
  • 2chiefly Biology divergence out from a central point, in particular evolution from an ancestral animal or plant group into a variety of new forms.

Derivatives

radiational

Pronunciation: /-ˈāSHənl/

adjective

radiationally

Pronunciation: /-ˈāSHənl-ē/

adverb

Origin:

late Middle English (denoting the action of sending out rays of light): from Latin radiatio(n-), from radiare 'emit rays' (see radiate)

radiation in other Oxford dictionaries

Definition of radiation in the British & World English dictionary

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