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.
Armenians in Turkey
The Armenian alphabet was also used alongside the Arabic alphabet on official documents of the Ottoman Empire, written in Ottoman Turkish. For example, the Aleppo edition of the official gazette of the Ottoman Empire, called "Frat" (Turkish and Arabic for the Euphrates) contained a Turkish section of laws printed in Armenian alphabet.