adult /əˈdʌlt, ˈæˌdʌlt/
  成年人(a.)成年人的,已成熟的
  adult /əˈdəlt, ˈædˌəlt/ 形容詞
  成人,成人的,成體(動)
  A·dult a.  Having arrived at maturity, or to full size and strength; matured; as, an adult person or plant; an adult ape; an adult age.
  A·dult, n. A person, animal, or plant grown to full size and strength; one who has reached maturity.
  Note: ☞ In the common law, the term is applied to a person who has attained full age or legal majority; in the civil law, to males after the age of fourteen, and to females after twelve.
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  adult
       adj : (of animals) fully developed; "an adult animal"; "a grown
             woman" [syn: big, full-grown, fully grown, grown,
              grownup]
       n 1: a fully developed person from maturity onward [syn: grownup]
            [ant: juvenile]
       2: any mature animal