sine qua non

One entry found for sine qua non.

Main Entry: si·ne qua non
Pronunciation: "si-ni-"kwä-'nän, -'nOn also "sE-; also "sI-ni-"kwA-'nän
Function: noun
Inflected Form(s): plural sine qua nons also sine qui·bus non /-"kwi-(")bus- also -"kwI-/
Etymology: Late Latin, without which not
: something absolutely indispensable or essential <reliability is a sine qua non for success>