East Turkestan UK /isːt ˌtɜː(ɹ)kɪˈstɑːn/US /isːt ˌtɜɹkɪˈstæn/ noun1 •A geographic region in northwestern China; in modern usage, a synonym of Xinjiang used by the East Turkestan independence movement.It is the administrative hq. of the dist. Altai [Chinese Aerhtai or Ashan], by which name the town is sometimes called, and which formed part (1944-50) of the East Turkestan Republic. — 1952