Romania Ro·ma·ni·a (rō-mā′nē-ə, -mān′yə) or Ru·ma·ni·a (ro͞o-) A country of southeast Europe with a short coastline on the Black Sea. Originally a Roman province, the area was conquered from the 3rd to the 12th century by a succession of invaders, including Goths, Huns, Magyars, and Mongols. In the 13th century two principalities …