precocity
  早熟,早成
  pre·coc·i·ty /prɪˈkɑsətɪ/ 名詞
  早熟,過早發育
  Pre·co·cious·ness, Pre·coc·i·ty n.  The quality or state of being precocious; untimely ripeness; premature development, especially of the mental powers; forwardness.
     Saucy precociousness in learning.   --Bp. Mannyngham.
     That precocity which sometimes distinguishes uncommon genius.   --Wirt.
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  precocity
       n : intelligence achieved far ahead of normal developmental
           schedules [syn: precociousness]