sine qua non - WordReference.com Dictionary of English

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  - since
  - sincere
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  - Sindebele
  - Sindhi
  - sindoor
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  - sine curve
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sine qua non

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Concise Oxford English Dictionary © 2008 Oxford University Press:
sine qua non /ˌsɪni kwɑː ˈnəʊn, ˌsɪni kweɪ ˈnɒn/

▶noun a thing that is absolutely essential.

– origin L., lit. ‘(cause) without which not’.

'sine qua non' also found in these Oxford entries:

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