The Collaborative International Dictionary of English v.0.48:

Misapprehension \Mis*ap`pre*hen"sion\, n.
   A mistaking or mistake; wrong apprehension of one's meaning
   of a fact; misconception; misunderstanding.
   [1913 Webster]

WordNet (r) 3.0 (2006):

misapprehension
    n 1: an understanding of something that is not correct; "he
         wasn't going to admit his mistake"; "make no mistake about
         his intentions"; "there must be some misunderstanding--I
         don't have a sister" [syn: mistake, misunderstanding,
         misapprehension]

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "misapprehension":
   abuse of terms, catachresis, clerical error, contorting,
   corrigendum, distortion, eisegesis, erratum, error, failure, fault,
   faute, garbling, gloss, human error, malentendu, malobservation,
   misapplication, miscalculation, miscarriage, miscitation,
   misconception, misconstruction, miscount, misdeal, misexplanation,
   misexplication, misexposition, misidentification, misintelligence,
   misinterpretation, misjudgment, misplay, misprint, misquotation,
   misreading, misrendering, misreport, miss, misstatement, mistake,
   mistranslation, misunderstanding, misuse, misuse of words,
   perversion, squeezing, torturing, twisting, typo,
   typographical error, wrenching