Unbirthday Definition

noun

A day that is not one's birthday but is celebrated as though it were.

Wiktionary

Other Word Forms of Unbirthday

Noun

Singular:
unbirthday
Plural:
unbirthdays

Origin of Unbirthday

  • un- +‎ birthday, coined by Lewis Carroll in Through the Looking-Glass (1871).

    From Wiktionary

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unbirthday