barˈbarianism [f. barbarian n. + -ism.] The state or condition of a barbarian (in various senses). 1855Milman Lat.Chr. (1864) II. iv. §1. 169 Adapted to the youthful barbarianism of the state of society, and to the Oriental character.1864ReaderNo. 87. 255/1 A very paragon of prosy barbarianism.