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leap year

Syllabification: (leap year)
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Definition of leap year

noun

  • a year, occurring once every four years, that has 366 days including February 29 as an intercalary day.

Origin:

late Middle English: probably from the fact that feast days after February in such a year fell two days later than in the previous year, rather than one day later as in other years, and could be said to have “leaped” a day

leap year in other Oxford dictionaries

Definition of leap year in the British & World English dictionary