When you add 2+2 and get 5, this is an example of a situation where you err.
- to be wrong or mistaken; fall into error
- to deviate from the established moral code; do wrong
- Obsolete to go astray; wander
Origin of errMiddle English erren ; from Old French errer ; from Classical Latin errare, to wander, go astray, err ; from Indo-European an unverified form eras- from source race, German irren, to err
intransitive verberred, err·ing, errs
- To make an error or misjudgment: I erred in turning onto the dead-end street.
- To commit an act that is wrong; do wrong.
- Archaic To stray.
Origin of errMiddle English erren, from Old French errer, from Latin errāre, to wander; see ers- in Indo-European roots.
(third-person singular simple present errs, present participle erring, simple past and past participle erred)
From Middle English erren, from Old French errer (“to wander, err, mistake”), from Latin errō (“wander, stray, err, mistake”, verb), from Proto-Indo-European *ares- (“to be angry, lose one's temper”). Cognate with Old English eorre, ierre (“anger, wrath, ire”), Old English iersian (“to be angry with, rage, irritate, provoke”), Old English ierre (“wandering, gone astray, confused”).
- (law) Abbreviation of errors.
This is the customary abbreviation of this term as used in case citations. See, e.g., The Bluebook: A Uniform System of Citation, Nineteenth Edition (2010), "Court Names", Table T7, p. 432-434.