• WordNet 3.6
    • n misreckoning a mistake in calculating
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Webster's Revised Unabridged Dictionary
    • n Misreckoning An erroneous computation.
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Century Dictionary and Cyclopedia
    • n misreckoning An erroneous or false reckoning.
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In literature:

And whereas some have attributed the Dominion to the Man onely, as being of the more excellent Sex; they misreckon in it.
"Leviathan" by Thomas Hobbes
I can't understand How JOKIM could so have misreckoned.
"Punch, or the London Charivari, Vol. 98, June 21 1890" by Various