Webster's English Dictionary

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precocious

pre.co.cious \pri-'ko--sh*s\ \pri-'ka:s-*t-e-\ aj [L praecoc-, praecox 
   early ripening, precocious, fr. prae- +]coquere to cook - more at COOK 1: 
   exceptionally early in development or occurrence  2: exhibiting mature 
   qualities at an unusually early age  - pre.co.cious.ly av