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[er-er] /ˈɛr ər/
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.
  1. a mistake in a matter of fact or law in a case tried in a court of record.
  2. writ of error.
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).
Origin of error
1250-1300; Middle English errour < Latin errōr- (stem of error), equivalent to err- err + -or -or1
Related forms
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. 2018.
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Examples from the Web for errorless
Historical Examples
  • Remember, I have no hope of finding a solution in an errorless human being.

    Human Error Raymond F. Jones
  • He should at once begin to cancel and prove by checking that errorless cancellation always gives the right answer.

    The Psychology of Arithmetic Edward L. Thorndike
  • Paramount among agitators as I think Mazzini, it is a duty to admit that he was not errorless.

  • It knows simply what is there, and brings out the positive creature, errorless, unquestionable.

  • We will 'ostensibly work at the task of developing an errorless man', is the way I believe you put it.

    Human Error Raymond F. Jones
  • We can give them their errorless, mechanical men—just as soon as we find ways of correcting the blockage of the feedback pulses!

    Human Error Raymond F. Jones
  • And your iron-hard, errorless Superman is going to be the most emotionally sensitive creature you can produce.

    Human Error Raymond F. Jones
  • Sincerity, though not errorless, involves the least chance of error, and is without moral guilt.

    The Principles Of Secularism George Jacob Holyoake
  • The jewel itself was not so precious as the rays of enduring light which form it, and flash from it, beneath that errorless hand.

  • In the above description it has been assumed that the two errorless parallels have been selected.

British Dictionary definitions for errorless


a mistake or inaccuracy, as in action or speech: a typing error
an incorrect belief or wrong judgment
the condition of deviating from accuracy or correctness, as in belief, action, or speech: he was in error about the train times
deviation from a moral standard; wrongdoing: he saw the error of his ways
(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%
(statistics) See type I error, type II error
Derived Forms
error-free, adjective
Word Origin
C13: from Latin, from errāre to err
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for errorless



also, through 18c., errour, c.1300, from Old French error "mistake, flaw, defect, heresy," from Latin errorem (nominative error) "a wandering, straying, mistake," from errare "to wander" (see err).

Words for "error" in most Indo-European languages originally meant "wander, go astray" (but cf. Irish dearmad "error," from dermat "a forgetting").

Online Etymology Dictionary, © 2010 Douglas Harper
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errorless in Medicine

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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Idioms and Phrases with errorless
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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