the style that Pope, under certain situation (when making a statement on belief or morals, etc.) is shielded by the Holy Spirit from to be able to make a blunder.
the dogma that pope cannot, when acting in the formal character of supreme pontiff, err in determining a doctrine of Christian faith or guideline of morals, to be held by the church. It was decreed because of the Ecumenical Council within Vatican, July 18, 1870.
belief associated with the Roman Catholic Church that God shields the pope from error when he talks about belief or morality