What does 終日 mean?
終日 is a Japanese noun meaning “all day” in English. It is written as 終日 in kanji, しゅうじつ in hiragana, and shuujitsu in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
１月１４日（火曜日）のＤＴＡ終日技術会議には、１８社、３２人が出席しました。
The all-day DTA Technical meeting on Tuesday Jan 14 was attended by 32 people from 18 DTA firms.