A birthday 🎂 marks the anniversary of someone's birth or the day commemorating the origin or founding of something.
In essence, "birthday" has multiple, related meanings:
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Personal Anniversary: Primarily, it refers to the annual recurrence of the date on which a person was born. This is a celebration of an individual's life and the passing of another year.
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Date of Birth: It can also refer to the specific day a person was born. For example, "My birthday is on July 15th."
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Commemoration of Origins: Less commonly, "birthday" can describe a day that marks or celebrates the beginning of something, like the founding of an organization or the anniversary of a significant event. For example, "The company's 100th birthday celebration."
Therefore, the meaning of "birthday" depends on the context, but it always relates to a significant anniversary or date of origin.