丸まる一いち日にちまるいちにち○Meanings1nounthe whole day; all dayEmphasizes the entirety of a single day, often used when a full day is spent on something or when something lasts all day.丸まる一いち日にちかけて大おお掃そう除じをした。I spent the whole day doing a thorough cleaning.その作さ業ぎょうには丸まる一いち日