Usually means: A leap year's total days.
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We found 6 dictionaries that define the word 366 days:

General (5 matching dictionaries)
  1. 366 days: Vocabulary.com
  2. 366 days: Dictionary.com
  3. 366 days: Rhymezone
  4. 366 days: FreeDictionary.org
  5. 366 days: Mnemonic Dictionary

Computing (1 matching dictionary)
  1. 366 days: Encyclopedia

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Definitions from WordNet (366 days)

▸ noun:  in the Gregorian calendar: any year divisible by 4 except centenary years not divisible by 400


Opposite:
non-leap year, common year, regular year

Types:
leap year, more...



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Similar:

Opposite:
non-leap year, common year, regular year

Types:
leap year, more...




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