Answer: LEAPDAY

Possible questions:


February 29 we know 2 Answers
February 29th we know 1 Answer
Calendar rarity we know 1 Answer
The 29th, every so often we know 1 Answer
Quadrennial occurrence we know 2 Answers
March preceder, periodically we know 1 Answer
Intercalary event we know 1 Answer
Feb. 29 we know 1 Answer
Calendrical correction we know 1 Answer
Bissextile occurrence we know 1 Answer
2/29 we know 1 Answer

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