1 عمومی:: (لاتین) امر ناگزیر، لاینفك، امر لازم، شرط لازم
شبکه مترجمین ایران
1 general:: An essential element or condition, as in A perfect cake is the sine qua non of a birthday party. This phrase is Latin for "without which not" and has been used in English since about 1600. It appears more in writing than in speech.
American Heritage Idioms