A person who believes in or advocates for conversion, especially religious conversion; a missionary or evangelical preacher.
From 'conversion' plus the agent noun suffix '-ist' (one who practices or believes in). Used since the 19th century to describe religious figures and movements emphasizing conversion.
The label 'conversionist' was sometimes used positively by religious groups to describe committed evangelists, but could also be used critically by those skeptical of aggressive missionary tactics.
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