1.
by today; within the day; before the day is over
A formal way of saying something must happen or be completed before the current day ends.
A formal expression meaning "within today" or "by the end of today." A compound of 本日 (today — formal) and 中 (within; during). Used in business, customer service, and official communication.
Common collocations
- 本日中に届く: to arrive within today
- 本日中に完了する: to complete by today
- 本日中に回答する: to reply by today
- 本日中の発送: shipment within today
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Formal. In casual speech, 今日中 (by today) is the everyday equivalent. 本日中 is preferred in business emails, announcements, and customer-facing communication.