Definition from Wiktionary, the free dictionary
Proper noun 
- A landlocked area of continental Asia comprising Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan and Uzbekistan. In the USSR and the modern Russia the area is called Middle Asia (Средняя Азия).
- A larger area also including Kazakhstan, Mongolia, Tibet, western China, Afghanistan and parts of Siberia, Iran and Pakistan.
Coordinate terms 
smaller area of Central Asia