Mordvin mord·vin uncommon noun 1. a member of the agricultural people living in the central Volga provinces of European Russia SynonymsMordvaMordvinian 2. the Finnic language spoken by the Mordvin people SynonymsMordvaMordvinian Related words Word family Mordvinian Broader terms VolgaicRussian Parts Soviet Russia WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.