Jisho

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Noun
1. day of the week
Wikipedia definition
2. Names of the days of the weekDays of the week from the Roman period have been both named after the seven planets of classical astronomy and numbered, beginning with Sunday. In Slavic languages, a numbering system was adopted, but beginning with Monday. There was an even older tradition of names in Ancient Indian Astrology which could arguably be the origin of all these naming systems.
Read “Names of the days of the week” on English Wikipedia
Read “曜日” on Japanese Wikipedia
Read “Names of the days of the week” on DBpedia

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