1.
first day, opening day
The first day of an event, performance run, tournament, or period. Often refers to the opening day of a show or competition.
公演の初日は満席だった。
The opening day of the performance was sold out.
大会初日から好スタートを切った。
We got off to a good start from the first day of the tournament.
映画の初日興行収入が歴代一位を記録した。
The film's opening day box office revenue set an all-time record.
Compound of 初 (first) + 日 (day). Commonly used for performances, tournaments, sales events, and similar multi-day occasions.
COMMON COLLOCATIONS:
- 初日を迎える (to welcome opening day)
- 公演初日 (opening night of a show)
- 大会初日 (first day of a tournament)
- 初日から (from the very first day)
- 初日の出 (the first sunrise of the new year — read as はつひので)
USAGE NOTES:
Note the different reading 初日の出 (はつひので) specifically for the first sunrise of the new year, which is a traditional New Year's custom. In all other contexts, the reading is しょにち.