error

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An act, assertion, or belief that unintentionally deviates from what is correct, right, or true.
• noun The condition of having incorrect or false knowledge.
• noun The act or an instance of deviating from an accepted code of behavior.
• noun A mistake.
• noun Mathematics The difference between a computed or measured value and a true or theoretically correct value.
• noun 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.

from The Century Dictionary.

• noun A wandering; a devious and uncertain course.
• noun A deviation from the truth; a discrepancy between what is thought to be true and what is true; an unintentional positive falsity; a false proposition or mode of thought.
• noun An inaccuracy due to oversight or accident; something different from what was intended, especially in speaking, writing, or printing: as, a clerical error (which see, below).
• noun A wrong-doing; a moral fault; a sin, especially one that is not very heinous.
• noun The difference between the observed or otherwise determined value of a physical quantity and the true value: also called the true error.
• noun In law, a mistake in a judicial determination of a court, whether in deciding wrongly on the merits or ruling wrongly on an incidental point, to the prejudice of the rights of a party.
• noun Perplexity; anxiety; concern.
• noun In base-ball, a failure by one of the fielders to put out an opponent when he has the opportunity; a misplay by which a runner secures a base.
• In law, upon an appeal, to reverse the judgment or other determination of the court below, on account of error in its proceedings.

from the GNU version of the Collaborative International Dictionary of English.

• noun obsolete A wandering; a roving or irregular course.
• noun A wandering or deviation from the right course or standard; irregularity; mistake; inaccuracy; something made wrong or left wrong
• noun A departing or deviation from the truth; falsity; false notion; wrong opinion; mistake; misapprehension.
• noun A moral offense; violation of duty; a sin or transgression; iniquity; fault.
• noun (Math.) The difference between the approximate result and the true result; -- used particularly in the rule of double position.
• noun The difference between an observed value and the true value of a quantity.
• noun The difference between the observed value of a quantity and that which is taken or computed to be the true value; -- sometimes called residual error.
• noun (Law.) A mistake in the proceedings of a court of record in matters of law or of fact.
• noun (Baseball) A fault of a player of the side in the field which results in failure to put out a player on the other side, or gives him an unearned base.
• noun (Mensuration) the law which expresses the relation between the magnitude of an error and the frequency with which that error will be committed in making a large number of careful measurements of a quantity.
• noun (Mensuration) See under Probable.
• noun (Law) an original writ, which lies after judgment in an action at law, in a court of record, to correct some alleged error in the proceedings, or in the judgment of the court.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun uncountable The state, quality, or condition of being wrong.
• noun countable A mistake; an accidental wrong action or a false statement not made deliberately.
• noun computing, countable A failure to complete a task, usually involving a premature termination.
• noun statistics, countable The difference between a measured or calculated value and a true one.
• noun baseball, countable A play which is scored as having been made incorrectly.
• noun uncountable One or more mistakes in a trial that could be grounds for review of the judgement.
• verb computing To function improperly due to an error, especially accompanied by error message.
• verb telecommunications To show or contain an error or fault.
• verb nonstandard To err.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun inadvertent incorrectness
• noun departure from what is ethically acceptable
• noun (baseball) a failure of a defensive player to make an out when normal play would have sufficed
• noun a wrong action attributable to bad judgment or ignorance or inattention
• noun (computer science) the occurrence of an incorrect result produced by a computer
• noun part of a statement that is not correct
• noun a misconception resulting from incorrect information