Catholic Dictionary

Find accurate definitions of over 5,000 Catholic terms and phrases (including abbreviations). Based on Fr. John Hardon's Modern Catholic Dictionary, © Eternal Life. Used with permission.

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DEMONSTRATION, A POSTERIORI

Legitimate reasoning from premises that are better known than the conclusion. Yet the premises are effects posterior (or subsequent) in being or in time to the cause in the conclusion, e.g., demonstrations of the existence of God.