SINE QUA NON Meaning of SINE QUA NON in English sine qua non BrE AmE ˌsɪn i ˌkwɑː ˈnɒn ˌsiːn-, -eɪ-, -ˈnəʊn; ˌsaɪn i ˌkweɪ- AmE \ -ˈnɑːn -ˈnoʊn Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012