Sine Qua Non Definition

sĭnĭ kwä nŏn, nōn, sīnĭ, kwā
noun
An essential condition, qualification, etc.; indispensable thing; absolute prerequisite.
Webster's New World
Without which not. Something that is indispensable and upon which something else relies.
Webster's New World Law

Other Word Forms of Sine Qua Non

Noun

Singular:
sine qua non
Plural:
sine-qua-nons, sine-quibus-non

Origin of Sine Qua Non

  • Late Latin sine quā (causā) nōn without which (cause) not Latin sine without Latin quā feminine ablative of quī which Latin nōn not

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Latin sine qua non (“without which [cause] not").

    From Wiktionary

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