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An error that does not affect a substantial right or change the outcome of a trial and does not warrant reversal or other modification of the lower court's decision on appeal In science and engineering in general, an error is defined as a difference between the desired and actual performance or behavior of a system or object. Jul 10, 2025error objects are thrown when runtime errors occur.

The error object can also be used as a base object for user-defined exceptions. See below for standard built-in error types. See examples of error used in a sentence.

I was in error about the date. Jan 20, 2026error (third-person singular simple present errors, present participle erroring, simple past and past participle errored) (computing) to function improperly due to an error, especially. From longman business dictionary er‧ror /ˈerəˈerər/ noun [countable] 1 a mistake the confusion was the result of a computer error.

Simply put, an error is a mistake.