causa sine qua non
[kou-sah si-ne kwah nohn; English kaw-zuh sahy-nee kwey non, kaw-zuh sin-ey kwah nohn]
- an indispensable condition; requisite.
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Origin of causa sine qua non
literally, a cause without which not
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018