'Papal infallibility' definitions:

Definition of 'papal infallibility'

(from WordNet)
noun
Belief of the Roman Catholic Church that God protects the pope from error when he speaks about faith or morality

Definition of 'Papal infallibility'

From: GCIDE
  • Infallibility \In*fal`li*bil"i*ty\, n. [Cf. F. infaillibilit['e].] The quality or state of being infallible, or exempt from error; inerrability. [1913 Webster]
  • Infallibility is the highest perfection of the knowing faculty. --Tillotson. [1913 Webster]
  • Papal infallibility (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. [1913 Webster]