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

hyperactivity

play
noun hy·per·ac·tiv·i·ty \-ˌak-ˈti-və-tē\

Definition of hyperactivity

  1. :  the state or condition of being excessively or pathologically active; especially :  attention deficit disorder



1888

First Known Use of hyperactivity

1888

Rhymes with hyperactivity


Medical Dictionary

hyperactivity

play
noun hy·per·ac·tiv·i·ty \ˌhī-pə-ˌrak-ˈtiv-ət-ē\

Medical Definition of hyperactivity

plural hyperactivities

  1. :  a state or condition of being excessively or pathologically active; especially :  attention deficit disorder





Seen and Heard

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

WORD OF THE DAY

marked by propriety and good taste

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 angry oily prompt
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