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Definition of: infallible
(in·fal′ə·bəl) adjective
1. Exempt from fallacy or error of judgment.
2. Exempt from uncertainty or liability to error.
3. In Roman Catholic theology, insusceptible of error in matters relating to faith and morals: said of the pope speaking ex cathedra.
—noun One who or that which is infallible.
—in·fal′li·bil′i·ty, in·fal′li·ble·ness noun
—in·fal′li·bly adverb
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