Sine qua non or condicio sine qua non (plural sine quibus non) was originally a Latin legal term for "(a condition) without which it could not be" or "but for. Latin ( lingua Latīna, laˈtiːna is an Italic language, historically spoken in Latium and Ancient Rome. Law is a system of rules enforced through a set of Institutions used as an instrument to underpin civil obedience politics economics and society . . " or "without which (there is) nothing". It refers to an indispensable and essential action, condition, or ingredient.
As a Latin term, it occurs in the work of Boethius, and originated in Aristotelian expressions. Anicius Manlius Severinus Boethius (480&ndash524 or 525 was a Christian philosopher of the 6th century  In recent times it has passed from a merely legal usage to a more general usage in many languages, including English, German, French, Italian, Spanish, etc. English is a West Germanic language originating in England and is the First language for most people in the United Kingdom, the United States The German language (de ''Deutsch'') is a West Germanic language and one of the world's major languages. French ( français,) is a Romance language spoken around the world by 118 million people as a native language and by about 180 to 260 million people Italian ( or lingua italiana) is a Romance language spoken by about 63 million people as a First language, primarily in Italy. In Classical Latin the correct form uses the word condicio, but nowadays the phrase is sometimes found to be used with conditio, which has a different meaning in Latin ("foundation"). Classical Latin is the form of the Latin language used by the ancient Romans in what is usually regarded as "classical" Latin literature. The phrase is also used in economics, philosophy and medicine.
An example of the term's usage was annotated in H. W. Brand's biography of Andrew Jackson. Andrew Jackson (March 15 1767 June 8 1845 was the seventh President of the United States (1829&ndash1837 The book included a toast given by Jackson on the occasion of his receiving an honorary doctorate from Harvard University. The President responded to his listeners, "E pluribus unum, my friends. E pluribus unum, Latin for "Out of Many One" is a motto found on the Seal of the United States, along with Annuit cœptis and Sine qua non. "
It also appears in the commentary on Article 59 of the Fourth Geneva Convention on the protection of civilians during a time of war. The Fourth Geneva Convention (or GCIV) relates to the protection of Civilians during times of War " in the hands " of an enemy and under In this case the sine qua non refers to the assurance that relief aid will go to the civilian population and not be diverted towards "the benefit of the Occupying Power. "