Meaning of “radioactivity” in the English Dictionary

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"radioactivity" in British English

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radioactivitynoun [ U ]

uk /ˌreɪ.di.əʊ.ækˈtɪv.ə.ti/ us /ˌreɪ.di.oʊ.ækˈtɪv.ə.t̬i/

the quality that some atoms have of producing a type of energy that can be very harmful to health

the energy produced by atoms in this way:

A dangerous amount of radioactivity was released into the environment last month.

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