Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Origin: Perhaps because a date in such a year "jumps" one day ahead of the day on which it would otherwise have fallen

leap year

 noun
     
Related topics: Chronology
leap year [countable]
TMC a year, which happens every fourth year, when February has 29 days instead of 28
Definition from the Longman Dictionary of Contemporary English
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