Definify.com
Webster 1913 Edition
Infallibility
In-falˊli-bil′i-ty
,Noun.
[Cf. F.
infaillibilité
.] The quality or state of being infallible, or exempt from error; inerrability.
Infallibility
is the highest perfection of the knowing faculty. Tillotson.
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.