Crossword Genius

Quadrennial period of 366 days (4,4)

Ross

I believe the answer is:

leap year

(Other definitions for leap year that I've seen before include "such as 1984" , "The longest period of 12 months" , "2008? - with 24d" , "Two thousand and four the next one" , "March delayed now" .)

I've seen this clue in The Times.
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