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English definition of “precocious”

precocious

adjective uk   /prɪˈkəʊ.ʃəs/ us    /prəˈkoʊ-/
(especially of children) showing mental development or achievement much earlier than usual: A precocious child, she went to university at the age of 15. She recorded her first CD at the precocious age of twelve.Physically and mentally mature and immature disapproving describes a child who behaves as if they are much older than they are: a precocious little bratAffected and insincere
precociousness
noun [U] uk   /-nəs/ (formal precocity,   /-ˈkɒs.ɪ.ti/    /-ˈkɑː.sə.t̬i/) us  
(Definition of precocious from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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