first day; day one
Used for the first day of an event, period, or new situation such as work or school.
I get nervous on the first day of the new term.
The first day of the trip was rainy.
Standard kanji spelling.
Numerical variant, common in schedules and lists.
Compound of 一日 (いちにち, 'one day') and the ordinal suffix 目 (め, '-th').