| errancy | (noun) fallibility as indicated by erring or a tendency to err | - |
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| (noun) (Christianity) holding views that disagree with accepted doctrine; especially disagreement with papal infallibility | - |
| errand | (noun) a short trip that is taken in the performance of a necessary task or mission | - |
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| erratum | (noun) a mistake in printed matter resulting from mechanical failures of some kind | Synonyms: literal, literal error, misprint, typo, typographical error |
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| erroneousness | (noun) inadvertent incorrectness | Synonyms: error |
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| error | (noun) a wrong action attributable to bad judgment or ignorance or inattention | Synonyms: fault, mistake |
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| (noun) (baseball) a failure of a defensive player to make an out when normal play would have sufficed | Synonyms: misplay |
| (noun) inadvertent incorrectness | Synonyms: erroneousness |
| (noun) departure from what is ethically acceptable | Synonyms: wrongdoing |
| (noun) a misconception resulting from incorrect information | Synonyms: erroneous belief |
| (noun) part of a statement that is not correct | Synonyms: mistake |
| (noun) (computer science) the occurrence of an incorrect result produced by a computer | Synonyms: computer error |