Jisho

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Noun, Adverb (fukushi)
1. day before yesterday
Wikipedia definition
2. Daytime (astronomy)On Earth, daytime is roughly the period on any given point of the planet's surface during which it experiences natural illumination from indirect or (especially) direct sunlight. Other planets that rotate in relation to a luminous primary, such as a local star, also experience daytime of a sort, but this article primarily discusses daytime on Earth.
Read “Daytime (astronomy)” on English Wikipedia
Read “一昨日” on Japanese Wikipedia
Read “Daytime (astronomy)” on DBpedia
Other forms
一昨日 【おとつい】一昨日 【いっさくじつ】
Notes
おととい: Gikun (meaning as reading) or jukujikun (special kanji reading). おとつい: Gikun (meaning as reading) or jukujikun (special kanji reading).

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