puerilism

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noun pu·er·il·ism \ˈpyu̇(-ə)r-ə-ˌli-zəm, ˈpyu̇(-ə)r-ˌī-\

Definition of puerilism

  1. :  childish behavior especially as a symptom of mental illness

1924

First Known Use of puerilism

1924

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