coalitionist
/ˌkoʊəˈlɪʃənɪst/
noun
- A person who supports or is part of a coalition, especially in politics.
- The prime minister was a coalitionist who brought together several smaller parties to form a government.
- As a committed coalitionist, she believed in building bridges between different political groups.
- The coalitionist argued that working with other parties was the only way to pass the new law.
Antonyms