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1. An error or fault resulting from defective judgment, deficient knowledge, or carelessness.
2. A misconception or misunderstanding.
v. mis·took (mĭ-sto͝ok′), mis·tak·en (mĭ-stā′kən), mis·tak·ing, mis·takes
1. To understand wrongly; misinterpret: mistook my politeness for friendliness.
2. To recognize or identify incorrectly: He mistook her for her sister.
To make a mistake; err.

[From Middle English mistaken, to misunderstand, from Old Norse mistaka, to take in error : mis-, wrongly; see mei- in Indo-European roots + taka, to take.]

mis·tak′er n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
There was even a A BABY - possibly unplanned by his parents - was saddled with the name Mistaker, according to British birth registrations.
AN unplanned baby is usually loved like any other - but one boy was once named Mistaker.