radiation
Pronunciation
  • IPA: /ˌɹeɪ.di.ˈeɪ.ʃən/
  • (some US dialects) IPA: /ɹaɪ.di.ˈaɪ.ʃən/
Noun

radiation

  1. The shooting forth of anything from a point or surface, like diverging rays of light.
    heat radiation
    • 2016, Donald R. Prothero, The Princeton Field Guide to Prehistoric Mammals (page 136)
      The second [canid group] is the radiation of dogs in South America that began when the first canids arrived about 3 Ma, after crossing the Panama land bridge (Fig. 5.4).
  2. The process of radiating waves or particles.
  3. The transfer of energy via radiation (as opposed to convection or conduction).
  4. Radioactive energy.
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