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precocious (adj.)

1640s, "developed or ripe before the usual time," originally of plants, with -ous + Latin praecox (genitive praecocis) "maturing early," from prae "before" (see pre-) + coquere "to ripen," literally "to cook" (from PIE root *pekw- "to cook, ripen").

Originally of flowers or fruits. Figurative use, of persons, dates, etc., "characteristic of early maturity," by 1670s. Related: Precociously; precociousness. Obsolete princock "pert, forward, saucy boy or youth" (16c.-18c.) might be a rude, low slang folk-etymology alteration of Latin praecox.

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Definitions of precocious from WordNet

precocious (adj.)
characterized by or characteristic of exceptionally early development or maturity (especially in mental aptitude);
a precocious achievement
a precocious child
precocious (adj.)
appearing or developing early;
precocious flowers appear before the leaves as in some species of magnolias
From wordnet.princeton.edu