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English definition of “sine qua non”

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.Important and essential thingsInformation and messages
(Definition of sine qua non from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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