A-posteriori: knowledge, understanding or justification derived from sensory experience. “After the fact”, dependent on sense experience. Source: ‘What is Good? What is Bad? The Value of All Values across Time, Place and Theories’ by John McMurtry, Philosophy and World Problems, Volume I-III, UNESCO in partnership with Encyclopedia of Life Support Systems: Oxford, 2004-11.   

A-priori: knowledge, understanding or justification derived independently of sensory experience. Derived independently of sense experience e.g., 2+2=4. Truth by definition and tautological deduction is the mathematical model, but presuppositions are often falsely assumed a-priori. Source: ‘What is Good? What is Bad? The Value of All Values across Time, Place and Theories’ by John McMurtry, Philosophy and World Problems, Volume I-III,… Read More