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infantile autism

noun, Psychology.
a disorder appearing in children before the age of two and a half, characterized by lack of interest in others, impaired communication skills, and bizarre behavior, as ritualistic acts and excessive attachment to objects. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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infantile autism in Medicine

infantile autism n.
A severe disorder of childhood characterized by withdrawal, preoccupation with fantasy, language impairment, and abnormal behavior, such as ritualistic acts and excessive object attachment. Also called Kanner's syndrome.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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