成年
せいねん
seinen
JLPT N1nounVocabularyLevel 100 - JLPT N1
Quick answer
成年 (せいねん (seinen)) means "Adulthood". It is a Japanese noun. Pronunciation, examples, and related kanji are on this page.
Meaning
Adulthood
Also : Adult age · Majority
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Example Sentences
20歳で成年になる。
はたちでせいねんになる。
One reaches adulthood at 20 years old.
成年後見制度について調べた。
せいねんこうけんせいどについてしらべた。
I researched the adult guardianship system.
Kanji in this word
Grammar to study at this level
- [Noun/Verb dictionary form] + に際して～に際して (ni saishite) - On the occasion of
- [Noun] + をもとに(して)～をもとに (wo moto ni) - Based on
- [Noun/Verb dictionary form] + にあたって～にあたって (ni atatte) - When doing; Upon
- [Verb/Adjective/Noun] + にしろ/にせよ～にしろ／にせよ (ni shiro/ni seyo) - Even if; Regardless of
- [Noun] + をめぐって～をめぐって (wo megutte) - Concerning; Over; Surrounding
Last updated Jul 22, 2026
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