A person who believes in or practices exclusion; or relating to the belief that certain groups should be kept separate or excluded.
From 'exclude' + '-ist' (one who practices). The suffix '-ist' denotes someone who advocates for or practices a particular ideology or belief.
During the English Civil War era, 'Exclusionists' were politicians who wanted to exclude the Catholic Duke of York from the throne—the term shows how a political position can become labeled with '-ist' to identify its adherents.
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