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English definition of “radiation”

radiation

noun [U]     /ˌreɪ.diˈeɪ.ʃən/
C1 a form of energy that comes from a nuclear reaction and that can be very dangerous to health : Many servicemen suffered radiation sickness after the early atomic tests .Radiation and radioactivity energy from heat or light that you cannot see : microwave / ultraviolet / electromagnetic radiationRadiation and radioactivity
(Definition of radiation noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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