Sine-qua-non meaning

sĭnĭ kwä nŏn, nōn, sīnĭ, kwā
An essential element or condition.
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An essential condition, qualification, etc.; indispensable thing; absolute prerequisite.
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An essential or indispensable element, condition, or ingredient.
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Without which not. Something that is indispensable and upon which something else relies.
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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