[N-COUNT 可数名词]（法律意义上的）成年人 An adult is a mature, fully developed person. An adult has reached the age when they are legally responsible for their actions.
Becoming a father signified that he was now an adult...
当了父亲意味着他已是个成年人了。
Children under 14 must be accompanied by an adult.
14岁以下的儿童必须由成人陪同。
2
[N-COUNT 可数名词]成年动物 An adult is a fully developed animal.
[oft N n]
...a pair of adult birds.
一对成年鸟
3
[ADJ 形容词]成年的；属于成人的Adult means relating to the time when you are an adult, or typical of adult people.
[ADJ n]
I've lived most of my adult life in London.
我成年之后的大部分时间都是在伦敦度过的。
4
[ADJ-GRADED 能被表示程度的副词或介词词组修饰的形容词]成熟的；老成的 If you say that someone is adult about something, you think that they act in a mature, intelligent way, especially when faced with a difficult situation.
[v-link ADJ]
[approval]
We were very adult about it. We discussed it rationally over a drink.
在这件事上我们表现得很成熟。我们一边喝酒一边心平气和地谈了谈。
...dealing with emerging sexuality in an adult way.
平静对待出现的性征
5
[ADJ 形容词]（涉及性内容的电影或书籍）仅限于成人的 You can describe things such as films or books as adult when they deal with sex in a very clear and open way.
...an adult movie.
成人电影
Oxford
adult★AWL/ˈædʌlt; NAmEˈædʌlt//əˈdʌlt; NAmEəˈdʌlt/
noun
,
adjective
adultadultsnoun★1★a fully grown person who is legally responsible for their actions （法律上指能为自己的行为负责的）成年人SYN
grown-up
◆Children must be accompanied by an adult.儿童必须要有大人陪同。◆Why can't you two act like civilized adults?你们俩为什么就不能像有教养的成年人那样行事呢？2★a fully grown animal 成年动物◆The fish return to the river as adults in order to breed.这种鱼长成以后回到河中产卵。adjective★1★fully grown or developed 成年的；发育成熟的◆preparing young people for adult life指导年轻人准备过成人生活◆the adult population成年人口◆adult monkeys长成的猴子2behaving in an intelligent and responsible way; typical of what is expected of an adult （智力、思想、行为）成熟的，成人的SYN
grown-up
◆When my parents split up, it was all very adult and open.我父母离异时，事情处理得很成熟、很开放。3[only before noun ]intended for adults only, because it is about sex or contains violence 仅限成人的（因有色情或暴力内容）◆an adult movie仅供成人观看的电影☞see also
1a fully-grown person, or one who is considered to be legally responsible for their actions → child: Some children find it difficult to talk to adults.2a fully-grown animal: The adults have white bodies and grey backs.
adult1 noun
adult2 adjective
adultadult2 ●●●W3AWL adjective
Word Origin
Examples
Thesaurus
Collocations
1[only before noun] fully grown or developed: an adult lion the adult population He lived most of his adult life in Scotland.2typical of an adult’s behaviour or of the things adults do: dealing with problems in an adult way That wasn’t very adult of you.3[only before noun] adult films, magazines etc are about sex or related to sex: The film is rated R for language and adult themes.