One of the mysteries of the English language finally explained.
The state or condition of behaving like a child; childish behaviour or childishness; specifically (a) (in an adult) a reversion to infantile behaviour, usually as a symptom of mental disorder; (b) (in a child) the stage of normal development which follows infantilism and precedes puberty.
1920s; earliest use found in The Daily Courier. From puerile + -ism.
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