The branch of philosophy dealing with the study of knowledge; theory of knowledge, asking such questions as "What is knowledge?", "How is knowledge acquired?", "What do people know?", "How do we know what we know?", "How do we know it is true?", and so on.
From Ancient Greek ἐπιστήμη, from ἐπίσταμαι + -λογία, from λέγω. The term was introduced into English by the Scottish philosopher James Frederick Ferrier (1808-1864).
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