separatist
se·pa·ra·tist
noun
1.
an advocate of secession or separation from a larger group (such as an established church or a national union)
adjective
1.
having separated or advocating separation from another entity or policy or attitude
- “a breakaway faction”
Origin
From separate + -ist.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.