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English definition of “attention deficit hyperactivity disorder”

attention deficit hyperactivity disorder

noun [U]     (abbreviation ADHD) UK
a condition in which someone, especially a child, is often in a state of activity or excitement and unable to direct their attention towards what they are doing Note: This condition is usually called 'attention deficit disorder' in the US.Mental and psychiatric disorders
(Definition of attention deficit hyperactivity disorder noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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