sine qua non: Meaning and Definition of

si•ne qua non

Pronunciation: (sī'nē kwā non', kwä, sin'ā Lat. si'ne kwä&sylpnōn'), [key]
  1. an indispensable condition, element, or factor; something essential: Her presence was the sine qua non of every social event.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
sine prole sinew
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