The term Habsburg Austria may refer to the lands ruled by the Austrian branch of the Habsburgs, or the historical Austria. Depending on the context, it may be defined as:The Duchy of Austria, after 1453 the Archduchy of Austria
The Erblande, Habsburg hereditary lands before 1526
The Austrian Circle of the Holy Roman Empire
The Habsburg monarchy as a whole, or after 1804 the Austrian Empire
Cisleithania, the Austrian half of the Austro-Hungarian Empire from 1867 to 1918
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Text from the Wikipedia article “Habsburg Monarchy”, available under CC BY-SA 4.0.