error (a faulty process of thought that leads to conclusions out of agreement with reality) / error (the resulting thought, conception, assumption, belief, determination, etc., of a flawed thought process) / error (the condition of one who has made and maintains such incorrect conclusions) / mistake (an action taken in such condition of faulty belief) / error (a failure, misfunction) / error (the condition of something that is not representative of reality)

to be mistaken, to be wrong

unless I'm mistaken, if I'm not mistaken

by mistake, in error, erroneously, mistakenly

(transitive) to mislead, to throw off

youthful error, youthful mistake (mistake done when - and because - one was young)

plural of erreur