What does 初日 mean?
初日 is a Japanese noun meaning “first day; opening day” in English. It is written as 初日 in kanji, しょにち in hiragana, and shonichi in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
初日から番狂わせが多かった。
There were many upsets right from the first day.