Definition: The Greek term for "Aristotle" is "Aristos." It refers to a person who, according to ancient tradition, lived between 384-322 BC. Aristotle was a philosopher, mathematician, physicist, astronomer, geographer and logician. He wrote extensively on many subjects, including metaphysics, epistemology (the study of knowledge), ethics, physics, geometry, astronomy, and political philosophy. The term "Aristotle" is also often used to refer to the ancient Greek philosopher who lived between 384-322 BC, commonly known as Aristotle.