Chagatai language
After the absorption of the Kara-Khanid Khanate by the Chagatai Khanate, the ethnonym Karluk became rarely used. The Karluk language was the primary basis for the later lingua-franca of the Chagatai Khanate and Central Asia under the Timurid dynasty. It is therefore designated by linguists and historians as the Chagatai language, but its contemporaries, such as Timur and Babur, simply called it "Turki".