sine qua non
sine qua non (sI-nee kway nonorsin-ay kwah nohn), n. [Latin “without which not”] An indispensable condition or thing; something on which something else necessarily depends. — Also termed conditio sine qua non. [Cases: Negligence 379.]
sine qua non (sI-nee kway nonorsin-ay kwah nohn), n. [Latin “without which not”] An indispensable condition or thing; something on which something else necessarily depends. — Also termed conditio sine qua non. [Cases: Negligence 379.]