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See more synonyms for hyperactivity on Thesaurus.com
  1. the condition of being hyperactive.
  2. hyperkinesia.
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Origin of hyperactivity

First recorded in 1885–90; hyperactive + -ity
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for hyperactivity

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Word Origin and History for hyperactivity


1852, from hyper- + activity.

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Online Etymology Dictionary, © 2010 Douglas Harper

hyperactivity in Medicine


  1. A general restlessness or excess of movement, as that in children with minimal brain dysfunction or hyperkinesis.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

hyperactivity in Science


  1. An abnormally high level of activity or excitement shown by a person, especially a child, that interferes with the ability to concentrate or interact with others.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.