/ Dictionary / Index C causa sine qua non*: Meaning and Definition of Find definitions for: cau•sa si•ne qua non Pronunciation: (kou'sä si'ne kwä nōn' Eng. kô'z&schwa sī'nē kwā non', kô'z&schwa sin'ā kwä nōn'), [key] — Latin. Latin. an indispensable condition; requisite. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. causality causation Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language