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

 

hyperactivity

 noun
noun
BrE BrE//ˌhaɪpərækˈtɪvəti//
 
; NAmE NAmE//ˌhaɪpərækˈtɪvəti//
 
[uncountable]
 
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a state in which a person, especially a child, is too active and only able to keep quiet and still for short periods

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