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sine qua non noun

  /ˌsaɪni kweɪ ˈnɑn/ , /ˌsaɪnɪ kweɪ ˈnɒn/ , /ˌsɪn(e)ɪ kwɑː ˈnɒn/ , /ˌsɪn(e)ɪ kwɑː ˈnəʊn/ , /ˌsɪni kwɑ ˈnoʊn/ , /ˌsɪni kwɑ ˈnɑn/
  • An essential or indispensable element, condition, or ingredient.
 sine qua non
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