Nicaean /naɪˈsi.ən/noun 3adjective 2forms 1 noun3 •A native or inhabitant of Nicaea (modern-day Iznik, Turkey) or the Empire of Nicaea. •A person who supports the Nicene Creed. •A native or inhabitant of Nice (anciently Nicaea), France. adjective2 •Of, from or relating to Nicaea (modern-day Iznik, Turkey). •Of, from or relating to the Empire of Nicaea, a medieval polity centred on the city. formsNicaeans