also: いちじつ
I take the medicine three times a day.
This work will be finished in one day.
all day; the whole day; from morning till night
Only with reading いちにち
Emphasizes the entire duration of a day. Restricted to the reading いちにち.
It rained all day yesterday.
He worked the whole day without a break.
When read as ついたち, this meaning is standard. With the reading いちにち, it is less common and may be used in contexts like deadlines or schedules. See also １日 (ついたち).
See also: 一日 (ついたち)
The deadline is the first day of next month.
Take the medicine three times a day.
The move was an all-day job.
I work eight hours a day.
day's journey; one day's travel
doing a good deed each day