Austria-Hungary
geographical name
Aus·tria-Hun·ga·ry ˈȯ-strē-ə-ˈhəŋ-gə-rē 
ˈä-
dual monarchy of central Europe 1867–1918 which included Bohemia, Moravia, Bukovina, Transylvania, Galicia, and what is now Austria, Hungary, Slovenia, Croatia, and northeastern Italy
Note: The assassination of Austrian Archduke Francis Ferdinand in Austria-Hungary on June 28, 1914 was the immediate cause of World War I.
Austro-Hungarian
ˈȯ-(ˌ)strō-ˌhəŋ-ˈger-ē-ən
adjective or noun ˈä-