Constantinopolitan UK /ˌkɒnˌstæn.tɪ.nəˈpɒ.lɪ.tən/US /ˌkɑnˌstæn.tɪ.nəˈpɑ.lɪ.tən/adjective 1noun 1forms 1 adjective1 •Relating to Constantinople (modern-day Istanbul). noun1 •(historical) A native or inhabitant of Constantinople (modern-day Istanbul). formsConstantinopolitans