What does 成年 mean?
成年 is a Japanese noun meaning “majority, adult age” in English. It is written as 成年 in kanji, せいねん in hiragana, and seinen in romaji. This word is part of JLPT N3 vocabulary.
Example sentence
あなたの娘さんはいつ成年に達したのですか。
When did your daughter come of age?