Sine qua non

By Deane Barker

Latin for “without which, not.” It’s used to refer to something indispensable – “without this thing, this other thing is not possible.”

Why I Looked It Up

I can’t remember the specific usage that caused me to look it up, but I’ve seen this for years.

Postscript

Added on

From The Tyranny of Clichés:

…an idea that assumes with Hegelian orthodoxy that expansions of the State are the sine qua non of progress.

Postscript

Added on

From Harry Potter and the Art of Spying:

What is sine qua non? A wonderful Latin phrase that means an essential action, condition, or ingredient; as a legal term, it means a condition or preexisting ingredient without which that which follows cannot exist.

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