Etymology
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sine qua non

"an indispensable condition," Latin, literally "without which not," from sine "without" (see sans) + qua ablative fem. singular of qui "which" (from PIE root *kwo-, stem of relative and interrogative pronouns) + non "not" (see non-). Feminine to agree with implied causa. The Latin phrase is common in Scholastic use. Sometimes a masculine form, sine quo non, is used when a person is intended. Proper plural is sine quibus non.

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Definitions of sine qua non

sine qua non (n.)
a prerequisite;
Synonyms: essential condition
From wordnet.princeton.edu

Dictionary entries near sine qua non

sincerity

sinciput

sine

sine die

sine prole

sine qua non

sinecure

sinew

sinewy

sinfonia

sinful