noun
Mongol Empire
Historical term for the empire founded by Genghis Khan. Often used in historical contexts; the modern country is モンゴル.
See also: モンゴル帝国
蒙古帝国は13世紀に広大な領土を支配した。
The Mongol Empire ruled a vast territory in the 13th century.
Synonymous; モンゴル帝国 is the more common modern term, while 蒙古帝国 is slightly more formal or historical.
From 蒙古 (もうこ, 'Mongolia') + 帝国 (ていこく, 'empire'). 蒙古 is an older Chinese-derived name for Mongolia.