The First Czechoslovak Republic (, ), often colloquially referred to as the First Republic (), was the first Czechoslovak state that existed from 1918 to 1938. Dominated by ethnic Czechs and Slovaks, the country was commonly called Czechoslovakia (Czech and ), a compound of "Czech" and "Slovak"; which gradually became the most widely used name for its successor states. It was composed of former territories of Austria-Hungary, inheriting different systems of administration from the formerly Austrian (Bohemia, Moravia, a small part of Silesia) and Hungarian territories (mostly Upper Hungary and Carpathian Ruthenia).