Decapolitan adjective 2noun 2forms 1 adjective2 •Of or relating to the Decapolis (a group of ten cities on the eastern frontier of the Roman Empire located in modern-day Israel, Jordan and Syria) •Of or relating to the Decapolis (an alliance of ten free imperial cities in Alsace within the Holy Roman Empire (now in Grand Est, France) from 1354 to 1678) noun2 •A native or inhabitant of the Decapolis (a group of ten cities on the eastern frontier of the Roman Empire located in modern-day Israel, Jordan and Syria) •A native or inhabitant of the Decapolis (an alliance of ten free imperial cities in Alsace within the Holy Roman Empire (now in Grand Est, France) from 1354 to 1678) formsDecapolitans