(education) The distinction drawn by some language teachers between an "error" (a mistaken belief that a given usage or construction is correct; or, an incorrect use resulting from such a belief) and "a mistake" (an accidental use of a usage or construction despite knowing that it is incorrect).

Used when someone's mistakes or flaws are acknowledged, as a reminder that everyone makes mistakes and has flaws.

When you notice that an enemy is making an error, take care not to interfere with the enemy from completing it so you can take advantage at the right time.