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Noun: birthday  'burth,dey
  1. An anniversary of the day on which a person was born (or the celebration of it)
    "They threw a surprise party for her 30th birthday"
     
  2. The date on which a person was born
    "He always took the day off work on his birthday";
    - natal day [archaic]

Derived forms: birthdays

Type of: anniversary, date, day of remembrance, day of the month

Encyclopedia: Birthday, Deathday and Other Stories