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1. An act, assertion, or belief that unintentionally deviates from what is correct, right, or true.
2. The condition of having incorrect or false knowledge.
3. The act or an instance of deviating from an accepted code of behavior.
4. A mistake.
5. Mathematics The difference between a computed or measured value and a true or theoretically correct value.
6. 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.

[Middle English errour, from Old French, from Latin error, from errāre, to err; see ers- in Indo-European roots.]

er′ror·less adj.


without error
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.errorless - free from error; "an errorless baseball game"
perfect - being complete of its kind and without defect or blemish; "a perfect circle"; "a perfect reproduction"; "perfect happiness"; "perfect manners"; "a perfect specimen"; "a perfect day"


Having no errors:
References in periodicals archive ?
How did "waived tests" (that once connoted such extreme simplicity that anyone could do them errorlessly and with which no substantial adverse consequence could occur if an error was made) come to include numerous uncommon analytes that are tested by very sophisticated technologies by very unsophisticated personnel, with results upon which important medical decisions are made?
Five of the 7 participants performed errorlessly on the first symmetry probe (six of six probe trials correct); the remaining 2 participants made one error each (five of six correct).
All children readily learned the pretraining tasks and performed errorlessly on the generalized identity-matching tasks, thereby demonstrating reflexivity (Boelens, 2001; Green, 1990; Sidman et al., 1986).