Unbirthday

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

An unbirthday (originally written un-birthday) is an event celebrated on all days of the year which are not a person's birthday. It is a neologism which first appeared in Lewis Carroll's 1871 novel Through the Looking-Glass.

Excerpt from the Wikipedia article “Unbirthday”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: John Tenniel, Public domain, via Wikimedia Commons.