This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. One who secedes or advocates separation, especially from an established church; a sectarian or separationist.

n. One who advocates disjunction of a group from a larger group or political unit: Basque separatists.

n. One who advocates cultural, ethnic, or racial separation.

n. Someone who advocates separation from the established Church; a member of any of various sects or schismatics.

n. A person who advocates or seeks the splitting of one country or territory into two politically independent countries or territories.

adj. Advocating ecclesiastical separation.

adj. Advocating or seeking the separation of one country or territory into two politically independent countries or territories.

n. One who withdraws or separates himself; especially, one who withdraws from a church to which he has belonged; a seceder from an established church; a dissenter; a nonconformist; a schismatic; a sectary.

n. One who withdraws or separates himself; one who favors separation. Especially

n. In recent British politics, an epithet applied by the Unionist party to their opponents, whom they charge with favoring the separation of Ireland from the United Kingdom.

Of, pertaining to, or characteristic of separatists or separatism; advocating separation: as, separatist politics; separatist candidates for Parliament; a separatist movement.

adj. having separated or advocating separation from another entity or policy or attitude

n. an advocate of secession or separation from a larger group (such as an established church or a national union)

"Nobody in the PMO's communications office has yet answered the question why Harper has been using the term separatist when speaking of the Bloc Québecois for his anglophone audience and souverainiste when he speaks French."

independent   

separatism   

dissenter    nonconformist    schismatic    sectary   

Kurdish    antislavery    sectary    populist    socialistic