A philosopher or scholar who studies epistemology, investigating questions about how we gain knowledge and what makes something count as true.
From Greek 'episteme' (knowledge) + 'logos' (study/discourse) + '-ist' (person who practices), forming the standard term for a knowledge theorist, popularized in academic philosophy.
Epistemologists ask questions like 'how do you really know anything?' so persistently that they'd make a detective jealous—they're basically the philosophers who refuse to accept 'I just know' as an answer.
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