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Definition of birthday:

  1. Of or pertaining to the day of birth, or its anniversary; as, birthday gifts or festivities.
  2. The day in which any person is born; day of origin or commencement.
  3. The day of the month in which a person was born, in whatever succeeding year it may recur; the anniversary of one's birth.


name day, anniversary, centennial, bicentennial, diamond jubilee, diamond anniversary, Merry Christmas, golden anniversary, date of birth, bicentenary, Happy Birthday/Easter/Anniversary, season's greetings, natal day, centenary, many happy returns.

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