/ ˈseprətɪst; NAmE / noun
a member of a group of people within a country who want to separate from the rest of the country and form their own government :
Basque separatists
► sep·ar·at·ism / ˈseprətɪzəm; NAmE / noun [ U ]
► sep·ar·at·ist adjective :
a separatist movement