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Sine Qua Non
Latin for "without which it could not be," an indispensable action or condition. Example: if Charlie had not left the keys in the ignition, his ten-year-old son could not have started the car and backed it over Polly's bike. So Charlie's act was the sine qua non of the damage to Polly's bike.
LA-NOLO4:DRU.1.6.1.20140626.27175