b-day
/B IY1 D EY0/noun
- 1
The anniversary of the day on which someone is born.
- 2
The anniversary of the day on which something is created.
- 3
The date on which someone is born or something is created, more commonly called birthdate or date of birth.
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Source: https://en.wiktionary.org/wiki/b-day, https://en.wiktionary.org/wiki/bday, https://en.wiktionary.org/wiki/birthday