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attention deficit disorder a behavioral disorder, usually beginning in childhood, characterized by inability to focus one's attention, impulsive behaviors, and, often, hyperactivity; attention deficit hyperactivity disorder (often abbreviated "ADHD").
attention deficit hyperactivity disorder a behavioral disorder, usually beginning in childhood, characterized by inability to focus one's attention, impulsive behaviors, and, often, hyperactivity (often abbreviated as "ADHD").
pay attention to direct your mind to something.