Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

attention deficit disorder

noun

Definition of attention deficit disorder

  1. :  a syndrome of disordered learning and disruptive behavior that is not caused by any serious underlying physical or mental disorder and that has several subtypes characterized primarily by symptoms of inattentiveness or primarily by symptoms of hyperactivity and impulsive behavior (as speaking out of turn) or by the significant expression of all three —abbreviation ADD



1978

First Known Use of attention deficit disorder

1978


Medical Dictionary

attention deficit disorder

noun

Medical Definition of attention deficit disorder

  1. :  a developmental disorder that is marked especially by persistent symptoms of inattention (such as distractibility, forgetfulness, or disorganization) or by symptoms of hyperactivity and impulsivity (such as fidgeting, speaking out of turn, or restlessness) or by symptoms of all three and that is not caused by any serious underlying physical or mental disorder Symptoms of attention deficit disorder range from mild to severe and always interfere with normal development and daily functioning. A diagnosis of attention deficit disorder typically requires that symptoms be present by the age of 12 and in more than one setting (such as both home and school). Attention deficit disorder may persist into adulthood, creating difficulties in one's occupation or social relationships. While hyperactivity and impulsivity are not always present as symptoms, attention deficit disorder is commonly referred to as attention deficit hyperactivity disorder. <Three percent to 10 percent of children are estimated to have attention deficit disorder, and the problem is more common in boys than in girls.—The Springfield (Massachusetts) Union-News, 8 Apr. 1993>—abbreviation ADD




Learn More about attention deficit disorder


Seen and Heard

What made you want to look up attention deficit disorder? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

to eat gluttonously or ravenously

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image567572573

Which of these is a synonym of unctuous?

maudlin prompt oily angry
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ