raison d'être

American  

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

noun

raisons d'être plural

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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Other Word Forms

Inflected Forms

noun

• raisons d'être
  plural

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

BeReal’s appeal ended the second the app started pushing users to friend randos and post more than once a day, defeating its entire raison d’être.

From Slate • Dec. 14, 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

It has built railroads too fast; that is, before they are absolutely required,—railroads running straight into the "bush," without any raison d'être; and the present reaction is but a natural sequence arising from extravagance.

From Under the Southern Cross or Travels in Australia, Tasmania, New Zealand, Samoa, and Other Pacific Islands by Ballou, Maturin Murray