一日・１日|いちにちichinichi
いちじつichijitsu
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Which spelling to use
一日一日 is the most common written form and consists entirely of kanji; it is the form beginners should normally choose.
１日１日 is a less common variant that combines a numeral with kanji; you may encounter it in writing, but beginners need not choose it.
Definitions
- noun, adverbone day
- adverb, nounall day (long); the whole day; from morning till night
- nounfirst day of the month
Synonyms & antonyms
- Synonym日ひNeutralRefers to a day or the sun, as in 「その日」 or 「日が昇る」; 「一日」 stresses the length of a day or the whole day.
- Related太陽日たいようじつWrittenAstronomical term for the time it takes the sun to pass the same meridian twice; not used in everyday speech.
- Related平均太陽日へいきんたいようじつWrittenAstronomical term for an averaged solar day, the basis of the 24-hour day; not used in everyday speech.
Default to 「一日」 for one day or the whole day; use 「日」 for a particular day, and keep 「太陽日」 and 「平均太陽日」 for astronomical contexts.
Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only
Japanese definitions
Kanji in this word
See also
