Home › Words › S › superadditionsuperadditionsuperaddition means the act or process of superadding.Among words judged in Lexicurio's Arena, superaddition ranks #11,075 of 42,747 for Qualifying.EtymologyFrom super- + addition.nounThe act or process of superadding.Something superadded.An oversum.Definitions & examples from Wiktionary (CC BY-SA 3.0).