Etymology
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infallibility (n.)

"quality of being incapable of error," 1610s, from Medieval Latin infallibilitas, from infallibilis (see infallible).

updated on November 18, 2015

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Definitions of infallibility from WordNet

infallibility (n.)
the quality of never making an error;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.