misreckoning

1. gerundparticiplepresentpresent participle and gerund of misreckon

plural misreckonings

1. A false reckoning; a miscalculation.First known use 16th c.

   And if by such a meane we might provide for times to come, appoynting that after the revolution of such or such a number of yeares, that extraordinary day might for ever be eclipsed; so that our misreckoning should not henceforward exceede foure and twenty houres.

   1603, Michel de Montaigne, translated by John Florio, Essays, III.11