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.
Timurid Empire
During the Timurid era, Central Asian society was bifurcated, with the responsibilities of government and rule divided into military and civilian spheres along ethnic lines. At least in the early stages, the military was almost exclusively Turko-Mongolian, while the civilian and administrative element was almost exclusively Persian. The spoken language shared by all the Turko-Mongolians throughout the area was Chaghatay. The political organization hearkened back to the steppe-nomadic system of patronage introduced by Genghis Khan. The major language of the period, however, was Persian, the native language of the Tājīk (Persian) component of society and the language of learning acquired by all literate and/or urban people. Timur was already steeped in Persian culture and in most of the territories he incorporated, Persian was the primary language of administration and literary culture. Thus the language of the settled "diwan" was Persian, and its scribes had to be thoroughly adept in Persian culture, whatever their ethnic origin. Persian became the official state language of the Timurid Empire and served as the language of administration, history, belles lettres, and poetry. The Chaghatay language was the native and "home language" of the Timurid family, while Arabic served as the language "par excellence" of science, philosophy, theology and the religious sciences.