missummation
nounEtymology From mis- + summation.
1
Archaic Wrong summation; incorrect addition.
- An inroad on the strongbox, or an erasure in the ledger, or a missummation in a fitted account, could hardly have surprised him more disagreeably.1817 December 31 (indicated as 1818), [Walter Scott], Rob Roy. […], volume (please specify |volume=I to III), Edinburgh: […] James Ballantyne and Co. for Archibald Constable and Co. […]; London: Longman, Hurst, Rees, Orme, and Brown, →OCLC: