What does attention deficit disorder mean?

attention deficit disorder meaning in Etymology Dictionary

(abbreviated incorporate) became an analysis when you look at the third edition of this "Diagnostic and Statistical Manual of Mental Disorders" (1980); expanded to attention deficit hyperactivity condition ("the co-existence of attentional issues and hyperactivity, with each behavior happening infrequently alone;" ADHD) in DSM-III (1987).

attention deficit disorder meaning in General Dictionary

a condition (mostly in kids) described as behavioral and mastering disorders