a deviation from accuracy or correctness; a mistake, as in action or speech: His speech contained several factual errors.
belief in something untrue; the holding of mistaken opinions.
the condition of believing what is not true: in error about the date.
a moral offense; wrongdoing; sin.
Baseball. a misplay that enables a base runner to reach base safely or advance a base, or a batter to have a turn at bat prolonged, as the dropping of a ball batted in the air, the fumbling of a batted or thrown ball, or the throwing of a wild ball, but not including a passed ball or wild pitch.
Mathematics. the difference between the observed or approximately determined value and the true value of a quantity.
a mistake in a matter of fact or law in a case tried in a court of record.
Philately. a stamp distinguished by an error or errors in design, engraving, selection of inks, or setting up of the printing apparatus. Compare freak1 ( def 5 ), variety ( def 8 ).

1250–1300; Middle English errour < Latin errōr- (stem of error), equivalent to err- err + -or -or1

errorless, adjective
errorlessly, adverb

1. blunder, slip, oversight. See mistake. 4. fault, transgression, trespass, misdeed. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
error (ˈɛrə)
1.  a mistake or inaccuracy, as in action or speech: a typing error
2.  an incorrect belief or wrong judgment
3.  the condition of deviating from accuracy or correctness, as in belief, action, or speech: he was in error about the train times
4.  deviation from a moral standard; wrongdoing: he saw the error of his ways
5.  maths, statistics a measure of the difference between some quantity and an approximation to or estimate of it, often expressed as a percentage: an error of 5%
6.  statistics type I error See type II error
[C13: from Latin, from errāre to err]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300, from O.Fr. errur, from L. errorem (nom. error) "a wandering, straying, mistake," from errare "to wander" (see err). Words for "error" in most I.E. languages originally meant "wander, go astray" (but Ir. dearmad "error," from dermat "a forgetting").
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

error er·ror (ěr'ər)

  1. A defect or insufficiency in structure or function.

  2. An act, an assertion, or a decision, especially one made in testing a hypothesis, that unintentionally deviates from what is correct, right, or true.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Computing Dictionary

error definition

1. A discrepancy between a computed, observed, or measured value or condition and the true, specified, or theoretically correct value or condition.
2. A mental mistake made by a programmer that may result in a program fault.
3. (verb) What a program does when it stops as result of a programming error.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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American Heritage
Idioms & Phrases


see comedy of errors; trial and error.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Besides the horrific grammar error in the first line, the question is technically wrong.
Throughout the weekend, scientists were energetically challenging the error and
  trying to get their own information out.
The company did not calculate a margin of error for its findings.
Fingerprinting experts have long claimed that their error rate in matching
  prints is zero-but without any supporting evidence.
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