1.
that day, the day in question, the appointed day
The specific day being discussed or the day when an event takes place.
Forms
当 (this, the relevant) + 日 (day)
Usage
Refers to the specific day being discussed or the day of an event. Can mean "that day" (referring to a past event) or "on the day" (same-day, as opposed to in advance).
Common collocations
- 当日券: same-day ticket
- 当日予約: same-day reservation
- 当日キャンセル: same-day cancellation
- イベント当日: the day of the event
- 当日受付: on-site registration