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[in-fuh n-tl-iz-uh m, -tahy-liz-, in-fan-tl-iz-uh m] /ˈɪn fən tlˌɪz əm, -taɪˌlɪz-, ɪnˈfæn tlˌɪz əm/

the persistence in an adult of markedly childish anatomical, physiological, or psychological characteristics.
an act, trait, etc., especially in an adult.
a speech disorder characterized by speech and voice patterns that are typical of very young children.

childish speech; baby talk

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

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


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