Relating to epistemology, the branch of philosophy concerned with the nature, sources, and validity of knowledge; dealing with questions about how we know what we know.
From Greek 'episteme' (knowledge, understanding) and 'logos' (study, reasoning). 'Episteme' derives from 'epistasthai' (to know, understand), literally meaning 'to stand upon' knowledge.
Every time you wonder 'How do I know this is true?' you're thinking epistemologically. It's the philosophical equivalent of checking your sources - but for all of human knowledge!
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