Descartes is a proper noun referring to the 17th‑century French philosopher René Descartes, or his family name. In academic use it denotes his philosophy or works (e.g., Cartesian coordinates, Cartesian doubt). The term is used in intellectual history, philosophy, and science, and is typically recognized as the surname of a major thinker whose ideas influenced modern rationalism. The pronunciation is a key marker in scholarly discourse.
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