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mandatory (B1)

カタカナ: マンダトリー

IPA: /ˈmændətɔːri/

Required by law, rules, or authority; something you have no choice but to do.

意味: 法律、規則、または権限によって要求されること。選択の余地がなく、必ず行わなければならないこと。

Attendance at the orientation session is mandatory for all new employees. — 新入社員全員にとって、オリエンテーションへの参加は必須です。
It is mandatory to have a valid passport when traveling internationally. — 海外旅行の際は、有効なパスポートを所持することが義務付けられています。

Japanese translations of Mandatory:

mandatory for (prepositional phrase): Required for a specific person or group. — "This document is mandatory for all participants."
mandatory to (prepositional phrase): Required to perform a certain action. — "It is mandatory to wear a helmet when riding a motorcycle."