The anniversary of the day on which someone is born. From 1570s
1867, Charles Dickens, , Chapter 2: Treats Of Oliver Twist's Growth, Education, And Board,Oliver Twist's ninth birthday found him a pale thin child, somewhat diminutive in stature, and decidedly small in circumference.
1903, L. Frank Baum, , The Fifth Surprise: The Monarch Celebrates His Birthday,One of the Wise Men said the King was born in February; another declared it was in May, and a third figured the great event happened in October. So the King issued a royal decree that he should have three birthdays every year, in order to be on the safe side; and whenever he happened to think of it he put in an odd birthday or two for luck.
1906, Edith Nesbit, , Chapter 9: The pride of Perks,"And we thought we'd make a nice birthday for him. He's been so awfully jolly decent to us, you know, Mother," said Peter, "and we agreed that next bun-day we'd ask you if we could."
1921 June 4, , in The Times,The King's Birthday, which occurred yesterday, will be officially observed to-day, and the customary list of honours conferred on the occasion is published.
The anniversary of the day on which something is created.
The date on which someone is born or something is created, more commonly called birthdate or date of birth.This is not an abbreviation of "birthday": abbreviation: DOB (date of birth.)
