raison d’être - definition and synonyms

noun [countable] 

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/ˌreɪzɒ̃ ˈdetrə/
singularraison d’être
pluralraisons d’être
  1. 1
    the reason why something exists or is considered to be important

    Sharing problems with others is the group’s raison d’être.

  2. 2
    the main purpose of someone’s life

    Looking after her grandchildren seemed to be her whole raison d’être.