Nagorno-Karabakh Republic /nəˌɡɔːnəʊ kɑːɹəˈbɑːk ɹɪˌpʌblɪk/ noun1 •(historical) An erstwhile Armenian-populated republic with limited recognition in the Nagorno-Karabakh region of the South Caucasus that existed between 1991 and 2024.