sine qua non

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sine qua non /ˌsɪnɪˌkwɑːˈnɑːn/ noun
plural sine qua nons
sine qua non
/ˌsɪnɪˌkwɑːˈnɑːn/
noun
plural sine qua nons
Learner's definition of SINE QUA NON
[count] formal
: something that is absolutely needed
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