The Collaborative International Dictionary of English v.0.48:

Misconception \Mis`con*cep"tion\, n.
   Erroneous conception; false opinion; wrong understanding.
   --Harvey.
   [1913 Webster]

WordNet (r) 3.0 (2006):

misconception
    n 1: an incorrect conception [ant: concept, conception,
         construct]

Moby Thesaurus II by Grady Ward, 1.0:

77 Moby Thesaurus words for "misconception":
   abuse of terms, airy nothing, autism, bubble, catachresis, chimera,
   clerical error, contorting, corrigendum, daydream, deception,
   deluded belief, delusion, dereism, distortion, dream, dream vision,
   dreamland, dreamworld, eisegesis, erratum, error, failure,
   false belief, fault, faute, garbling, gloss, human error,
   ignis fatuus, illusion, malentendu, malobservation, misapplication,
   misapprehension, misbelief, miscalculation, miscarriage,
   miscitation, 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, pipe dream, self-deceit, self-deception, self-delusion,
   squeezing, torturing, trick, trip, twisting, typo,
   typographical error, vapor, wrenching, wrong impression