Papal infallibility Meaning, Definition & Usage
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noun belief of the Roman Catholic Church that God protects the pope from error when he speaks about faith or morality
WordNet
Definitions
(R. C. Ch.) , the dogma that the pope can not, when acting in his official character of supreme pontiff, err in defining a doctrine of Christian faith or rule of morals, to be held by the church. This was decreed by the Ecumenical Council at the Vatican, July 18, 1870.