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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A POSTERIORI

From what is after, that is, from effect back to cause. Reasoning from experience or inductively. Opposite of a priori. This is the only valid proof for the existence of God, from creatures as effects to the Creator as their First Cause.