Etymology
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puerility (n.)

late 15c., puerilite, "a childish or silly act or expression," from Old 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"). Meaning "puerile character or condition, boyishness" is by 1570s.

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Definitions of puerility

puerility (n.)
the state of a child between infancy and adolescence;
Synonyms: childhood
puerility (n.)
a property characteristic of a child;
Synonyms: childishness
From wordnet.princeton.edu