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causa sine qua non

[ kou-sah si-ne kwah nohn; English kaw-zuh-sahy-nee kwey non, kaw-zuh-sin-ey kwah nohn ]
/ ˈkaʊ sɑ ˈsɪ nɛ kwɑ ˈnoʊn; English ˈkɔ zə ˈsaɪ ni kweɪ ˈnɒn, ˈkɔ zə ˈsɪn eɪ kwɑ ˈnoʊn /
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noun Latin.
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. 2022

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