Dictionary
2 ENTRIES FOUND:

leap year

noun

: a year of 366 days instead of 365 with February having 29 days instead of 28

Full Definition of LEAP YEAR

1
:  a year in the Gregorian calendar containing 366 days with February 29 as the extra day
2
:  an intercalary year in any calendar

First Known Use of LEAP YEAR

14th century

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