A person who supports, believes in, or practices coalition politics and cooperation between different groups or parties.
From coalition + -ist (advocate/practitioner suffix). The -ist suffix indicates someone who supports or practices a particular ideology. Coalitionist became common in 20th-century political analysis.
Coalitionists have a specific political philosophy—they believe compromise across party lines is stronger than pure majority rule, which is why they're celebrated in some countries and criticized in others!
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