Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “sine qua non”

sine qua non

noun [S]     formal
something that must be done or achieved before anything else is done or achieved : sine qua non of sth Aspiring business-school students in Europe know that fluent English is a sine qua non of success .
(Definition of sine qua non noun from the Cambridge Business English Dictionary © Cambridge University Press)
Focus on the pronunciation of sine qua non

Definitions of “sine qua non” in other dictionaries

Translations of “sine qua non”

Word of the Day


a good knowledge of something, or the fact that you know it so well

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More