Home › Words › O › orgiasticismorgiasticismorgiasticism · noun — wild, uncontrolled behaviour (especially sexual), like that of an orgy.Definition from Wiktionary (CC BY-SA 3.0).EtymologyFrom orgiastic + -ism.nounWild, uncontrolled behaviour (especially sexual), like that of an orgy.Definitions & examples from Wiktionary (CC BY-SA 3.0).