D defs.my
Entry 1 sense Webster, 1913

Infallibility

/ĭnˌ-fălˌ-ĭb-ĭl'-ĭt-ē/ · In·fal·li·bil·i·ty · IPA /ɪnˌfæləˈbɪləti/
01 n. The quality or state of being infallible, or exempt from error; inerrability.
  1. 1.
    The quality or state of being infallible, or exempt from error; inerrability.
    Infallibility is the highest perfection of the knowing faculty.” Tillotson.
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.