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Definition of attention deficit disorder noun from the Oxford Advanced Learner's Dictionary

 

attention deficit disorder

 noun
noun
BrE BrE//əˌtenʃn ˈdefɪsɪt dɪsɔːdə(r)//
 
; NAmE NAmE//əˌtenʃn ˈdefɪsɪt dɪsɔːrdər//
 
(also attention deficit hyperactivity disorder) [uncountable] (abbreviation ADD, ADHD)
 
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a medical condition, especially in children, that makes it difficult for them to pay attention to what they are doing, to stay still for long and to learn things