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critical period

noun
1.
(psychol) a period in a lifetime during which a specific stage of development usually occurs. If it fails to do so, it cannot readily occur afterwards
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Contemporary definitions for critical period
noun

a time of crisis; a turning point

noun

a time in a person's development in which a certain skill or characterized would be most readily acquired

Usage Note

psychology

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