Meaning of “radiation” in the English Dictionary

"radiation" in British English

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radiationnoun [ U ]

uk /ˌreɪ.diˈeɪ.ʃən/ us /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.

energy from heat or light that you cannot see:

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(Definition of “radiation” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"radiation" in American English

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radiationnoun [ U ]

us /ˌreɪ·diˈeɪ·ʃən/

physics energy in the form of waves or particles (= any of the smallest pieces of matter that make up atoms):

Residents argued that electromagnetic radiation emitted by the radar towers might pose a health hazard.

(the sending out of) heat, light, or energy in waves:

solar radiation

(Definition of “radiation” from the Cambridge Academic Content Dictionary © Cambridge University Press)