Mordvinia Syllabification: (Mord·vin·i·a)Pronunciation: /môrdˈvinēə/Definition of Mordvinia an autonomous republic in Russia, southeast of Nizhni Novgorod; population 835,400 (est. 2009); capital, Saransk. Also called Mordvinian Autonomous Republic. Mordvinia in other Oxford dictionaries Definition of Mordvinia in the British & World English dictionary