Home › Words › H › heptavalencyheptavalencyheptavalency means the condition of being heptavalent.Among words judged in Lexicurio's Arena, heptavalency ranks #26,134 of 42,749 for Qualifying.EtymologyFrom hepta- + valency.nounThe condition of being heptavalentDefinitions & examples from Wiktionary (CC BY-SA 3.0).