n. 1.  An error or fault resulting from defective judgment, deficient knowledge, or carelessness. 2.  A misconception or misunderstanding. v.  mis·took (mĭ-stk), mis·tak·en (mĭ-stākən), mis·tak·ing, mis·takes  v.tr. 1.  To understand wrongly; misinterpret: mistook my politeness for friendliness. 2.  To recognize or identify incorrectly: He mistook her for her sister. v.intr.  To make a mistake; err. [From Middle English mistaken, to misunderstand, from Old Norse mistaka, to take in error : mis-, wrongly; see  mei-1 in the Appendix of Indo-European roots + taka, to take.] mis·taker n.  | 
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