In philosophy, empiricism is a theory of knowledge which asserts that knowledge arises from experience. Empiricism is one of several competing views about how we know "things," part of the branch of philosophy called epistemology, or "the Theory of Knowledge". Empiricism emphasizes the role of experience and evidence, especially sensory perception, in the formation of ideas, while discounting the notion of innate ideas (except in so far as these might be inferred from empirical reasoning, as in the case of genetic predisposition).

In the philosophy of science, empiricism emphasizes those aspects of scientific knowledge that are closely related to evidence, especially as discovered in experiments. It is a fundamental part of the scientific method that all hypotheses and theories must be tested against observations of the natural world, rather than resting solely on a priori reasoning, intuition, or revelation. Hence, science is considered to be methodologically empirical in nature.

The term "empiricism" has a dual etymology. It comes from the Greek word εμπειρισμός, the Latin translation of which is experientia, from which we derive the word experience. It also derives from a more specific classical Greek and Roman usage of empiric, referring to a physician whose skill derives from practical experience as opposed to instruction in theory.

The term "empirical" was originally used to refer to certain ancient Greek practitioners of medicine who rejected adherence to the dogmatic doctrines of the day, preferring instead to rely on the observation of phenomena as perceived in experience. The notion of tabula rasa ("clean slate" or "blank tablet") dates back to Aristotle, and was developed into an elaborate theory by Avicenna and demonstrated as a thought experiment by Ibn Tufail. The doctrine of empiricism was later explicitly formulated by John Locke in the 17th century.

He argued that the mind is a tabula rasa (Locke used the words "white paper") on which experiences leave their marks. Such empiricism denies that humans have innate ideas or that anything is knowable without reference to experience.

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