sine qua non
noun
si·ne qua non
ˌsi-ni-ˌkwä-ˈnän
-ˈnōn
also ˌsē-;
also ˌsī-ni-ˌkwā-ˈnän
plural sine qua nons also sine quibus non
-ˌkwi-(ˌ)bu̇s-
also -ˌkwī-
: something absolutely indispensable or essential
reliability is a sine qua non for success
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Merriam-Webster unabridged
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