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

attention deficit disorder

noun
 
/əˌtenʃn ˈdefɪsɪt dɪsɔːdə(r)/
 
/əˌtenʃn ˈdefɪsɪt dɪsɔːrdər/
(also attention deficit hyperactivity disorder)
[uncountable]
(abbreviation ADD, ADHD)
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  1. a condition, usually beginning in childhood, that makes it difficult for somebody to pay attention and concentrate, and may make it difficult for them to control their behaviourTopics Mental healthc2
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noun
 
 
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