English

Definition of radioactivity noun from the Oxford Advanced Learner's Dictionary

 

radioactivity

 noun
noun
BrE BrE//ˌreɪdiəʊækˈtɪvəti//
 
; NAmE NAmE//ˌreɪdioʊækˈtɪvəti//
 
[uncountable]
 
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harmful radiation (1) that is sent out when the nuclei (= central parts) of atoms are broken up the study of radioactivity a rise in the level of radioactivity