Sentence:  Hence, while preserving his autocratic power, the Czar decrees a “Gosudarstvennaia Duma,” or State Council. The elections for this <WSD>Duma</WSD> will cover the whole territory of the Empire, ... 
Meaning of the word marked with <WSD> tags:  A Russian legislative assembly such as the historical duma of the Russian Empire or the modern lower house of the (Federal Assembly) (the Russian national parliament).