Usually means: Celebration on any day except.
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We found 7 dictionaries that define the word unbirthday:

General (7 matching dictionaries)
  1. unbirthday: Oxford Learner's Dictionaries
  2. unbirthday: Collins English Dictionary
  3. Unbirthday, unbirthday: Wordnik
  4. unbirthday: Wiktionary
  5. unbirthday: Dictionary.com
  6. Unbirthday: Wikipedia, the Free Encyclopedia
  7. unbirthday: TheFreeDictionary.com

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Definitions from Wiktionary (unbirthday)

▸ noun:  A day that is not one's birthday but is celebrated as though it were.

Similar:
unholiday, nonholiday, February 31, non-leap year, common year, nondate, nonworkday, unfather, dies non, nonbeneficiary, more...



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Similar:
unholiday, nonholiday, February 31, non-leap year, common year, nondate, nonworkday, unfather, dies non, nonbeneficiary, more...



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