Jisho

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Noun, Noun which may take the genitive case particle 'no'
1. leap year
Wikipedia definition
2. Leap yearA leap year (or intercalary or bissextile year) is a year containing one additional day (or, in the case of lunisolar calendars, a month) in order to keep the calendar year synchronized with the astronomical or seasonal year. Because seasons and astronomical events do not repeat in a whole number of days, a calendar that had the same number of days in each year would, over time, drift with respect to the event it was supposed to track.
Read “Leap year” on English Wikipedia
Read “閏年” on Japanese Wikipedia
Read “Leap year” on DBpedia
Other forms
うるう年 【うるうどし】閏年 【じゅんねん】

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