This is the 2664th most frequent Chinese word.
一日
"One day."
Usage of '一日' suggests 'any specific day or the day' when the verb action is completed.
你一日到达，请通知我们。
Once you arrive on any given day, please inform us.
Usage of '一日' refers to 'one day' to indicate a specific day's duration in the context.
一日的计划总是充满希望。
A day's plan is always filled with hope.
Usage of '一日' conveys the meaning of 'one day' emphasizing the passage of time in terms of feeling.