WordReference Random House Learner's Dictionary of American English © 2015
atˈten•tion ˌdef•i•cit disˌor•der, n. [uncountable]
Pathology, Psychologya disorder characterized by the inability to concentrate on tasks, by impulsiveness, and often overactivity.

Collins Concise English Dictionary © HarperCollins Publishers::

attention deficit disorder n
  1. a disorder, particularly of children, characterized by excessive activity and inability to concentrate on one task for any length of time
    Abbreviation: ADD

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