A person who excludes others or supports exclusion; someone who believes in keeping certain groups separate or out.
From 'exclude' + '-er' (one who does). This agent noun was formed to describe people who actively practice exclusion, particularly during religious and political disputes.
This word was most common in 17th-century English religious debates when 'Exclusioners' referred to those who wanted to exclude Catholics from political power—it shows how specific political movements create their own vocabulary.
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