sine qua non - definition in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online (US)

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sine qua non

noun [S] uk   /ˌsɪn.eɪ.kwɑːˈnəʊn/  us   /-ˈnoʊn/ formal
a necessary condition without which something is not possible: An interest in children is a sine qua non of teaching.
Translations of “sine qua non”
in Chinese (Traditional) 必要條件,必備條件…
in Chinese (Simplified) 必要条件,必备条件…
(Definition of sine qua non from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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