Sine qua non or conditio sine qua non was originally a Latin legal term for "without which it could not be" ("but for"). It refers to an indispensable and essential action, condition, or ingredient. In recent times it has passed from a merely legal usage to a more general usage in many languages, including English, German, French, Italian, etc. In Classical Latin the form conditio would be condicio. The phrase is also used in economics.
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