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sine qua non

noun [S]
 
 
/ˌsɪn.eɪ.kwɑːˈnəʊn/ US  /-ˈnoʊn/ formal

Definition

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 noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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