seceder

/sɪˈsiːdər/
noun
  1. A person who withdraws from a political or religious organization, alliance, or union.
    • Historians still debate the motives of each seceder during the Civil War.
    • The church council expelled the seceder for refusing to follow the new doctrine.
    • The seceder left the party after disagreeing with its new policies.
Antonyms
What does "seceder" mean? | whatsthatwordmean | whatsthatwordmean