Languages of the Ottoman Empire
The language of the court and government of the Ottoman Empire was Ottoman Turkish, but many other languages were in contemporary use in parts of the empire. Although the minorities of the Ottoman Empire were free to use their language amongst themselves, if they needed to communicate with the government they had to use Ottoman Turkish.
Turkish language
Following the adoption of Islam c. 950 by the Kara-Khanid Khanate and the Seljuq Turks, who are both regarded as the ethnic and cultural ancestors of the Ottomans, the administrative language of these states acquired a large collection of loanwords from Arabic and Persian. Turkish literature during the Ottoman period, particularly Divan poetry, was heavily influenced by Persian, including the adoption of poetic meters and a great quantity of imported words. The literary and official language during the Ottoman Empire period (c. 1299–1922) is termed Ottoman Turkish, which was a mixture of Turkish, Persian, and Arabic that differed considerably and was largely unintelligible to the period's everyday Turkish. The everyday Turkish, known as "kaba Türkçe" or "rough Turkish", spoken by the less-educated lower and also rural members of society, contained a higher percentage of native vocabulary and served as basis for the modern Turkish language.