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sine qua non

sine qua non Sine qua non means an indispensable or necessary condition: something that must be present for another event or state to occur.

Sine qua non means an indispensable or necessary condition: something that must be present for another event or state to occur. In this usage, the second thing does not happen unless the sine qua non is present.

Sources

Drafting source: Baldwin Dictionary of Philosophy and Psychology, 1901. 1901 New York Macmillan original; archive index checked 2026-10-18. “Necessary (1) and (2) Sufficient Condition” (Necessary (1) and (2) Sufficient Condition).
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PsychTerms (psychterms.org), CC BY 4.0, version 1. “sine qua non.” Development preview.

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sine qua non

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Sources

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