IPA: /dɪsˈjuːnɪst/
KK: /dɪsˈjunɪst/
A person who supports the idea of separating from a larger group or union, particularly in the context of political or social issues.
During the Civil War, many disunionists argued for the separation of the Southern states from the Union.
Disunionist → It is formed from "dis-" (meaning apart) and "union" (from Latin "unio", meaning unity or oneness) and the suffix "-ist" (meaning a person who). A disunionist is a person who advocates for separation or division rather than unity.
Think of someone who wants to be 'apart' ('dis-') from a 'union' or group — that's what a disunionist is.