成 人(せいじん)

せいじん

noun

adult, coming of age

1. adult

A person who has reached the age of majority.

成人(せいじん)向(む)けの映画(えいが)だ。

This is a movie for adults.

お酒(さけ)は成人(せいじん)しか買(か)えない。

Only adults can buy alcohol.

成人(せいじん)の数(かず)は年々(ねんねん)減(へ)っている。

The number of adults is decreasing year by year.

2. coming of age

The process or event of reaching adulthood.

成人(せいじん)式(しき)に参加(さんか)した。

I attended the coming-of-age ceremony.

日本(にほん)では十八歳(じゅうはっさい)で成人(せいじん)になる。

In Japan, you become an adult at 18.

成人(せいじん)の日(ひ)には、多(おお)くの若者(わかもの)が着物(きもの)を着(き)て写真(しゃしん)を撮(と)る。

On Coming of Age Day, many young people wear kimono and take photos.

成人(せいじん) refers to adults and the process of becoming an adult.

CULTURAL NOTE:
成人(せいじん)の日(ひ) (Coming of Age Day) is a national holiday in Japan held on the second Monday of January. Young people who turned 20 (or now 18, after the 2022 law change) during the year celebrate with ceremonies and often wear traditional clothing.

COMMON COLLOCATIONS:

成人(せいじん)式(しき) (coming-of-age ceremony)
成人(せいじん)の日(ひ) (Coming of Age Day)
成人(せいじん)向(む)け (for adults)
成人(せいじん)病(びょう) (adult diseases/lifestyle diseases)
成人(せいじん)年齢(ねんれい) (age of majority)

SIMILAR WORDS:

成人(せいじん): adult (legal/formal sense)
大人(おとな): adult (general, everyday)
成年(せいねん): age of majority (more legal/formal)

Related Words

Related: 大人(おとな) (adult (general))

Antonym: 未成年(みせいねん) (minor)

general

Added 2026.1.12 15:42 · Revised 2026.5.25 23:40

03000/03378_seijin