一日
also: いちじつ
Meanings
1
one day; a day
Refers to a single day as a unit of time or a specific day. Can be used adverbially.
I take the medicine three times a day.
This work will be finished in one day.
2
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.
3
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.
Usage patterns
- 一日に〈数〉回... times a day
Take the medicine three times a day.
- 一日がかりで〈動詞〉to take a whole day to do something
The move was an all-day job.
- 一日〈数〉時間... hours a day
I work eight hours a day.
Expressions· 9
- 一日一歩one step each day
- 日一日とday by day; with each passing day
- 一日か二日a day or two; in a day or two
- 一日も早いas soon as possible; speedy; as rapid as possible
- 一日も早くas soon as possible; without further delay
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- 日がな一日all day long
- 一日を過ごすspend the day; pass a day
- あの世千日この世一日a day in life is better than a thousand days in the afterlife