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Infallibility

n.
  1. The quality or state of being infallible, or exempt from error; inerrability.
    2. 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.