| err | (verb) to make a mistake or be incorrect | Synonyms: mistake, slip |
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| (verb) wander from a direct course or at random | Synonyms: drift, stray |
| 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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| errant | (adjective) straying from the right course or from accepted standards | - |
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| (adjective) uncontrolled motion that is irregular or unpredictable | - |
| erratic | (adjective) liable to sudden unpredictable change | Synonyms: fickle, mercurial, quicksilver |
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| (adjective) likely to perform unpredictably | Synonyms: temperamental |
| (adjective) having no fixed course | Synonyms: planetary, wandering |
| erratically | (adverb) in an erratic unpredictable manner | Synonyms: unpredictably |
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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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| errhine | (adjective) causing nasal discharge | - |
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| erring | (adjective) capable of making an error | Synonyms: error-prone |
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| erroneous | (adjective) containing or characterized by error | - |
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| erroneously | (adverb) in a mistaken or erroneous manner | Synonyms: mistakenly |
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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 |
| errorless | (adjective) free from error | - |
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