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Empiricism, in philosophy, the view that all concepts originate in experience, that all concepts are about or applicable to things that can be experienced, or that all rationally acceptable beliefs or propositions are justifiable or knowable only through experience. This broad definition accords with the derivation of the term empiricism from the ancient Greek word empeiria, ā€œexperience.ā€ Concepts are said to be ā€œa posterioriā€ (Latin: ā€œfrom the latterā€) if they can be applied only on...