Definition of raison d’être noun from the Oxford Advanced Learner's Dictionary


raison d’être

BrE BrE//ˌreɪzɒ̃ ˈdetrə//
; NAmE NAmE//ˌreɪzɔːn ˈdetrə//
[singular] (from French)
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the most important reason for somebody’s/something’s existence Work seems to be her sole raison d'être.
See the Oxford Advanced American Dictionary entry: raison d’être