birthday
/ˈbɜːθ.deɪ/
Proposed by a contributor, not yet supported by evidence.
Also seen as: birthdays · birthdaying · birthdayed
Sense 1
Meaning · English
The anniversary of the day on which someone is born.
Noun
Examples
When's your birthday? Mine's on April 1.
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).
Sense 2
Meaning · English
The anniversary of the day on which something is created.
Noun
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).
Sense 3
Meaning · English
To celebrate one's birthday.
VerbRegister: informal
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).
Common questions
What does “birthday” mean?
The anniversary of the day on which someone is born.
Is “birthday” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.