noun
during a period; within a period; while
Used in formal or written contexts to indicate that something happens or is valid within a specified time frame. Often follows a time expression (e.g., 今期内, 年度内).
申請は今期内に行ってください。
Please submit your application within this period.
契約は期内に更新する必要がある。
The contract must be renewed within the period.