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"Deutschosterreich"? Does that mean "German Austria"
Yes, that is correct.
With the end of WWI, what was left of the Austro-Hungarian empire was broken up into different nationalities. The remaining part was German-speaking, and hence the name "German Austria". This was later simplified to just "Austria". Of course, in 1938, Hitler "annexed" Austria... and his continued expansion led to the outbreak of WWII.