error Definition

error
noun

1. A mistake, inaccuracy or misapprehension.

Thesaurus: mistake, blunder, fault, lapse, misjudgement, inaccuracy, slip, slip-up, false step, gaffe, gaucherie, wrongdoing, misdeed, offence, transgression.
2. The state of being mistaken.
3. The possible discrepancy between an estimate and an actual value or amount.

Example: a margin of error

Etymology: 14c: Latin, also meaning ‘a wandering or straying'.