Prescribed or designated; referring to something fixed in advance (e.g., a prescribed form, designated procedure). Common in formal documents and instructions.
申請書は所定の用紙に必要事項を記入してください。
Please fill in the required items on the prescribed application form.
所定の期限内に手続きを済ませる必要がある。
You need to complete the procedure within the designated deadline.
会議は所定の時間に開始する予定です。
The meeting is scheduled to start at the appointed time.