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infantilism

[in-fuh n-tl-iz-uh m, -tahy-liz-, in-fan-tl-iz-uh m] /ˈɪn fən tlˌɪz əm, -taɪˌlɪz-, ɪnˈfæn tlˌɪz əm/
noun
1.
the persistence in an adult of markedly childish anatomical, physiological, or psychological characteristics.
2.
an infantile act, trait, etc., especially in an adult.
3.
a speech disorder characterized by speech and voice patterns that are typical of very young children.
Origin
1890-1895
1890-95; infantile + -ism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for infantilism

infantilism

/ɪnˈfæntɪˌlɪzəm/
noun
1.
(psychol)
  1. a condition in which an older child or adult is mentally or physically undeveloped
  2. isolated instances of infantile behaviour in mature persons
2.
childish speech; baby talk
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for infantilism
n.

1894 in a psychological sense; see infantile + -ism. Earlier in a physiological sense, "retarded and imperfect physical development."

Online Etymology Dictionary, © 2010 Douglas Harper
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infantilism in Medicine

infantilism in·fan·til·ism (ĭn'fən-tl-ĭz'əm, ĭn-fān'tl-)
n.

  1. A state of arrested development in an adult, characterized by retention of infantile mentality, accompanied by stunted growth and sexual immaturity, and often by dwarfism.

  2. Extreme immaturity, as in behavior or character.

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