say it: SEP-ur-uh-tist
separatist is a noun and adjective meaning "an advocate of secession or separation from a larger group (such as an established church or a national union)". It carries 2 recorded senses.
an advocate of secession or separation from a larger group (such as an established church or a national union)
church service
having separated or advocating separation from another entity or policy or attitude
“a breakaway faction”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for separatist come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.