Webster's English Dictionary

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adult

1. adult \*-'d*lt, 'ad-.*lt\ \*-'d*lt-.hu.d\ \*-'d*lt-n*s, 'ad-.*lt-\ aj [L 
   adultus, pp. of adolescere to grow up fr. ad- + -olesce]re (fr. alescere to 
   grow) - more at OLD 1: fully developed and mature : GROWN-UP  2: of, 
   relating to, or characteristic of adults  - adult.hood n
2. adult n : one that is adult; esp : a human being after an age (as 21) 
   spec ified by law