WordReference Random House Learner's Dictionary of American English © 2017
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.

  • WordReference Random House Unabridged Dictionary of American English © 2017
    attention def′icit disor′der, 
  • Pathology, Psychologya condition, usu. in children, marked by inattentiveness, dreaminess, and passivity.
  • Pathology, Psychology(no longer in technical use) See attention deficit hyperactivity disorder.
    • 1980–85

    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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