1
- a person who is fully grown or developed成年人：
children should be accompanied by an adult.
儿童应有成人陪同。
1.1
- a fully developed animal成年动物。
1.2
- Law a person who has reached the age of majority【律】（达到法律规定成熟年龄的）成年人。
1
- (of a person or animal) fully grown or developed（人, 动物）长成的, 成年的：
the adult inhabitants of Britain.
英国的成年居民。
1.1
- of or for adult people（为）成年人的：
adult education
成人教育
the responsibilities of adult life.
成人时期的种种责任。
1.2
- emotionally and mentally mature（情感和精神上）成熟的：
an effort to be adult and civilized.
变得成熟文明的努力。
1.3
- suitable only for adults (used euphemistically to refer to a sexually explicit film, book, or magazine)只适于成人的（委婉用法, 用来指有明显性描写的电影、书籍或杂志）。
派生词
adulthood
nounadultly
adverb词源
mid 16th cent.: from Latin adultus, past participle of adolescere 'grow to maturity' （see ADOLESCENT）.