«وإن كان ذلك الحكم بدون العلاقة سميت اتفاقية»
If that judgment is made without such a relation, it is called coincidental.
«إذا كان الإنسان ناطقا فالحمار ناهق»
If a human is rational, a donkey brays.
The two clauses are stated together without the previously described relation of entailment. Accepting both claims does not show that human rationality causes, or essentially entails, a donkey’s braying. This lack of a necessary link is what distinguishes the coincidental connective.