1.
joining, enrollment, subscription
The act of joining or becoming a member of a group, organization, plan, or service. Commonly used for formal memberships such as insurance, unions, international organizations, and subscription services.
保険に加入した。
I enrolled in insurance.
組合への加入を検討している。
I'm considering joining the union.
この国は来年、国際機関に正式に加入する予定だ。
This country is scheduled to formally join the international organization next year.
Used for formal, institutional membership — not for casually joining a group of friends. The particle に marks what is being joined, and the particle に or への introduces the target.
COMMON PATTERNS:
- 〜に加入する (to join ~)
- 〜への加入 (joining ~)
- 加入者 (member, subscriber)
- 加入手続き (enrollment procedure)
SIMILAR WORDS:
- 加入 — joining a group/plan/service (formal membership)
- 入会 — joining a club or association
- 参加 — participating in an event or activity