Home › Words › S › stadialismstadialismstadialism means the theory that a society, culture, etc. passes through a series of developmental stages.Among words judged in Lexicurio's Arena, stadialism ranks #36,606 of 42,747 for Qualifying.EtymologyFrom stadial + -ism.nounThe theory that a society, culture, etc. passes through a series of developmental stages.Definitions & examples from Wiktionary (CC BY-SA 3.0).