| 1. | a condition, usu. in children, marked by inattentiveness, dreaminess, and passivity. |
| 2. | (no longer in technical use) attention deficit hyperactivity disorder. |

| attention deficit disorder n. Abbr. ADD 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. |
A disorder characterized by a difficulty in retaining focus, especially on tasks, for long periods of time.
Note: One of the most common reasons children are brought into therapy, ADD is often treated with the somewhat controversial drug Ritalin®, which is thought to work by stimulating the attention-focusing structures of the brain.
attention deficit disorder at·ten·tion deficit disorder (ə-těn'shən)
n.
Abbr. ADD
A childhood syndrome characterized by impulsiveness and short attention span, and sometimes by hyperactivity that often leads to learning disabilities and various behavioral problems.