error

An error is a mistake or the state of being wrong. (noun)

An example of an error is when you add 2+2 and get 5.
An example of error is when a mistake leads you to come to the wrong collusion and you continue to believe this incorrect conclusion.

See error in Webster's New World College Dictionary

noun

the state of believing what is untrue, incorrect, or wrong
a wrong belief; incorrect opinion
something incorrectly done through ignorance or carelessness; mistake
a departure from the accepted moral code; transgression; wrongdoing; sin
1. the difference between a computed or estimated result and the actual value, as in mathematics
2. the amount by which something deviates from what is required
☆ Baseball a misplay in fielding or throwing a ball which allows a runner to reach base or to advance to the next base: neither a wild pitch nor a passed ball is an error
Law a mistake in judgment or procedure of a court of record, usually prejudicial to one of the parties
Philately a flaw in a stamp or stamps from a defect in a printing plate, a difference in color, etc.

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See error in American Heritage Dictionary 4

(ĕrˈər)

noun

An act, assertion, or belief that unintentionally deviates from what is correct, right, or true.
The condition of having incorrect or false knowledge.
The act or an instance of deviating from an accepted code of behavior.
A mistake.
Mathematics The difference between a computed or measured value and a true or theoretically correct value.
Abbr. E Baseball A defensive fielding or throwing misplay by a player when a play normally should have resulted in an out or prevented an advance by a base runner.

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