Attention Deficit Hyperactivity Disorder Definition

noun
A syndrome, usually diagnosed in childhood, characterized by a persistent pattern of impulsiveness, a short attention span, and often hyperactivity, and interfering especially with academic, occupational, and social performance.
American Heritage
A psychological disorder, assessed on the basis of behavior appropriate to a given mental age, characterized by inability to concentrate, hyperactivity, impulsiveness, etc.
Webster's New World
A neurodevelopmental disorder that begins in childhood, characterized by persistent impulsiveness, difficulties in focusing on tasks or paying attention, and often hyperactivity, and interfering especially with academic, occupational, and social performance.
American Heritage Medicine

(neurology, pathology) A developmental disorder in which a person has a persistent pattern of impulsiveness and inattention, with or without a component of hyperactivity.

Wiktionary
Alternative form of attention deficit hyperactivity disorder.
Wiktionary
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