Definition from Wiktionary, the free dictionary
From Old French Tartare.
Proper noun 
- An agglutinative language belonging to the Uralian group of the Northwestern branch of Turkic languages. It is an official language of Tatarstan. There are some eight million speakers spread across Eastern Europe, Russia and Central Asia.
Tatar (plural Tatars)
- A person belonging to one of several Turkic, Tatar-speaking ethnic groups in Eastern Europe, Russia and Central Asia.
See also 
Proper noun