raison d'être


Concise Oxford English Dictionary © 2008 Oxford University Press:
raison d'être /ˌreɪzɒ̃ ˈdɛtrə/
noun (pl. raisons d'être pronunc. same) the most important reason or purpose for someone or something's existence.
– origin Fr., lit. ‘reason for being’.
'raison d'être' also found in these Oxford entries:

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