noun
1.
an often unintentional deviation from truth or accuracy
made an error in adding the figures
Synonyms: mistake, x
Related Word: inaccuracy; miscalculation, miscomputation; oversight, slip
2.
something (as an act, statement, or belief) that departs from what is or is generally held to be acceptable
spying on the opposing party proved to be a grave error
Synonyms: blooper, blunder, boner, bull, bungle, ||clanger, fluff, goof, lapse, miscue, misstep, mistake, rock, slip, slipup, trip; compare faux pas
Related Word: fault, misdoing, misjudgment, stumble; ||boo-boo, botch, fumble, muff; howler, screamer; impropriety, indecorum
3.
Synonyms: fallacy 1, erroneousness, fallaciousness, falsehood, falseness, falsity, untruth
Related Word: misreading, misunderstanding; delusion, illusion