Definition of precocious adjective from the Oxford Advanced American Dictionary

 

precocious

 adjective
adjective
NAmE//prɪˈkoʊʃəs//
 
(sometimes disapproving)
 
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(of a child) having developed particular abilities and ways of behaving at a much younger age than usual a precocious child who started her acting career at the age of 5 From an early age, she displayed a precocious talent for music.
precociously
 
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adverb a precociously talented child
precociousness(also precocity noun
NAmE//prɪˈkɑsət̮i//
 
)
[uncountable]
 
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his unusual precociousness
See the Oxford Advanced Learner's Dictionary entry: precocious