A person who practices or advocates devotion, especially to a particular saint or religious practice.
From 'devotion' plus '-ist' suffix (meaning someone who practices or believes in something). Common in Catholic contexts where devotion to specific saints was formalized into '-ist' practices.
The '-ist' suffix creates surprisingly specific roles—a 'devotionist' isn't just someone who's devout, but someone who specializes in or promotes a *particular* form of devotion, similar to how a 'pianist' specializes in pianos.
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