oversum noun 1verb 1forms 3 noun1 •A whole that is more than the sum of its parts; superaddition.The tradition consists in understanding a politically active unit as an oversum (that is, a super-additive entity): The whole is more than the sum of its parts. — 2004 verb1 •To add up incorrectly, arriving at a total that is too large.In an account in the ledger, which has been ruled off as square, it is found that the credit side has been oversummed by £ 100. — 1941 formsoversummed · oversumming · oversums
