A birthday is the anniversary of the birth of a person, or figuratively of an institution. Birthdays of people are celebrated in numerous cultures, often with birthday gifts, birthday cards, a birthday party, or a rite of passage. Wikipedia
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6 days ago · The meaning of BIRTHDAY is the day of a person's birth. How to use birthday in a sentence.
the day of a person's birth. a day marking or commemorating the origin, founding, or beginning of something.
the day that is exactly a year or number of years after a person was born: Happy birthday, Flavio!