Papal infallibility Meaning, Definition & Usage

  1. noun belief of the Roman Catholic Church that God protects the pope from error when he speaks about faith or morality

WordNet


Definitions
  1. (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.

Webster 1913