sine qua non

Definition of "sine qua non"
  1. An essential condition or action without which a certain outcome would not be possible
How to use "sine qua non" in a sentence
  1. Not having a valid driver's license is considered as the sine qua non for the revocation of car insurance.
  2. In research, a control group is the sine qua non for determining the effect of an experimental variable.
  3. Taking a written test is a sine qua non for getting a learner's permit.

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