Infallibility /(?)/

In·fal·li·bil·i·ty

Infallibility

n.
  1. The quality or state of being infallible, or exempt from error; inerrability.
    Infallibility is the highest perfection of the knowing faculty.

Phrases & Compounds
Papal infallibility
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.