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:
unbirthdaysOrigin of Unbirthday
-
un- + birthday, coined by Lewis Carroll in Through the Looking-Glass (1871).
From Wiktionary
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