raison d'être

American  

[rey-zohn de-truh, re-zawn de-tr^uh] / ˈreɪ zoʊn ˈdɛ trə, rɛ zɔ̃ ˈdɛ trə /

noun

plural

raisons d'être

1. reason or justification for being or existence.

   Art is the artist's raison d'être.

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raison d'être British  

/ rɛzɔ̃ dɛtrə /

noun

1. reason or justification for existence

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raison d'être Cultural  

1. A basic, essential purpose; a reason to exist: “Professor Naylor argues that in the nuclear age, infantry forces have lost their raison d'être.” From French, meaning “reason for being.”

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Etymology

Origin of raison d'être

Borrowed into English from French around 1865–70

Example Sentences

But, for smaller companies whose AI offerings are their raison d’être, there are pros and cons of the new era.

From The Wall Street Journal • Feb. 18, 2026

The problem isn’t the production but the musical’s shifting raison d’être.

From Los Angeles Times • Nov. 9, 2025

Unrestrained power, of course, is the president’s raison d’être.

From Salon • Sep. 27, 2025

Fundamentally, the format's raison d'être is now under question.

From BBC • Jul. 18, 2025

Substance also is the final cause, the raison d'être, of the reality of the accidental mode of being.

From Ontology or the Theory of Being by Coffey, Peter