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  1. Oxford American Dictionary

    attention deficit disorder

    • IPA[əˌten(t)SHən ˈdefəsət disˌôrdər]

    美式

    • n.
      a mental condition, beginning in childhood and often persisting into later life, that is characterized by persistent difficulty in maintaining attention and concentration, sometimes with a degree of impulsive or hyperactive behavior.

    • noun: attention deficit disorder, plural noun: attention deficit disorders