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- DictionarySi·ne qua non/ˌsinā ˌkwä ˈnōn/
noun
- 1. an essential condition; a thing that is absolutely necessary: "grammar and usage are the sine qua non of language teaching and learning"
noun
Phrase
A sine qua non or conditio sine qua non is an indispensable and essential action, condition, or ingredient. It was originally a Latin legal term for "[a condition] without which it could not be", "but for...", or "without which [there is] nothing." Also, "sine qua non causation" is the formal terminology for "but-for causation." Wikipedia