日|ひhi[0]heiban (flat)
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- nounday; days
- nounsun; sunshine; sunlight
- noun(the) day; daytime; daylight
- noundate; deadline
- noun(past) days; time (e.g. of one's childhood)
- nouncase (esp. unfortunate); eventas 〜した日には, 〜と来た日には, etc.
- Synonym日付ひづけNeutralThe date written on a document, as in 「日付を入れる」; it centers on the recorded date rather than days in general.
- Synonym日にちひにちCasualColloquial word for a day or a number of days, as in 「日にちを決める」; it points to a specific date more than 「日」 does.
- Synonym日々ひびNeutralEach day, everyday life, as in 「忙しい日々」; stresses the day-after-day passage of time.
- Synonym時日じじつWrittenWritten/formal prose; days or a date and time, as in 「時日を要する」.
- SynonymデーCasualColloquial loanword for a special day, used mostly as a suffix, as in 「バースデー」 and 「レディースデー」.
- Antonym夜よるNeutralThe opposite of 「日」 in its daytime sense; night, as in 「夜になる」.
- Antonym晩ばんNeutralAlso opposed to the daytime sense of 「日」; evening into night, as in 「朝から晩まで」.
For days or dates in general, 「日」 is the default; its sun sense appears mostly in set phrases like 「日が昇る」, and the sun itself is 「太陽」. Use 「日付」 for the date on a document, 「日にち」 for a date you set, 「日々」 for everyday life, and 「夜」/「晩」 for night.
Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only


