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Wiktionary
theory of knowledge

n. (context philosophy English) epistemology.

Wikipedia
Theory of knowledge (IB course)

Theory of knowledge is a compulsory subject in the International Baccalaureate Diploma Programme which is, in essence, similar to epistemology courses offered at many universities.

Usage examples of "theory of knowledge".

There is an awkward gulf between the two, which raises difficulties for the theory of knowledge.

It surprises me that some people still concern themselves with a theory of knowledge.