con·ven·tion·al·i·ty \kənˌvenchəˈnaləd.ē, -ətē, -i\noun (-es) 1.: the quality or state of being conventional; specifically: adherence to established or traditional social, intellectual, or artistic conventions 2.: something that is established by conventional use : a conventional usage, practice, or thing < the tired conventionalities of sex and violence in this melodrama — Anthony Boucher >