Dictionary.net

• One of the vast flats or plains of Europe and Asia, corresponding to the prairies, savannahs, and pampas of America.

1874 - Etymological and pronouncing dictionary of the English language
By Stormonth, James, Phelp, P. H.

• [Russ.] (Geog.) Extensive plains not at a great elevation above the sea ; as the steppes of Russia, Siberia, and Turkestan.

1895 - Glossary of terms and phrases
By Henry Percy Smith