[adult] adj [L adultus, pp. of adolescere to grow up, fr. ad- + -olescere (fr. alescere to grow)--more at old] (1531) 1: fully developed and mature: grown-up
2: of, relating to, intended for, or befitting adults "an ~ approach to a problem"
3: dealing in or with explicitly sexual material "~ bookstores" "~ movies" -- adult.hood n -- adult.ly adv -- adult.ness n
[2]adult n (1658): one that is adult; esp: a human being after an age (as 21) specified by law -- adult.like adj