puerility (n.)

late 15c., from Middle French puérilité (15c.), from Latin puerilitatem (nominative puerilitas) "childishness," from puerilis "boyish, youthful; childish, trivial, silly," from puer "child, boy," from PIE root *pau- (1) "few, little," with sense extended to "small, young" (source also of Latin putus "boy," Sanskrit putrah "son, boy," Avestan puthra- "son, child").

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