Sine-qua-non


[sahy-nee kwey non, kwah, sin-ey; Latin si-ne kwah-nohn] /ˈsaɪ ni kweɪ ˈnɒn, kwɑ, ˈsɪn eɪ; Latin ˈsɪ nɛ kwɑˈnoʊn/
noun
1.
an indispensable condition, element, or factor; something essential:
Her presence was the sine qua non of every social event.
sine qua non
/ˈsaɪnɪ kweɪ ˈnɒn/
noun
1.
an essential condition or requirement
sine qua non [(sin-i kwah non, nohn)]

The essential, crucial, or indispensable ingredient without which something would be impossible: “Her leadership was the sine qua non of the organization’s success.” From Latin, meaning “without which nothing.”
sine qua non
An essential element or condition, as in A perfect cake is the since qua non of a birthday party. This phrase is Latin for “without which not” and has been used in English since about 1600. It appears more in writing than in speech.

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