Dionysius of Chalcedon (Greek:Διονύσιος;fl. 320 BC)^[1] was aGreek philosopher anddialectician connected with theMegarian school. He was a native ofChalcedon on the coast ofBithynia.^[2] Dionysius was the person who first used the nameDialecticians to describe a splinter group within the Megarian school "because they put their arguments into the form of question and answer".^[3] One area of activity for the dialecticians was the framing ofdefinitions,^[4] andAristotle criticises a definition of life by Dionysius in hisTopics:^[5]

This is, moreover, what happens to Dionysius' definition of "life" when stated as "a movement of a creature sustained by nutriment, congenitally present with it"

Dionysius is also reported to have taughtTheodorus the Atheist.^[6]

• Dorandi, Tiziano (1999). "Chapter 2: Chronology". In Algra, Keimpe; et al. (eds.).The Cambridge History of Hellenistic Philosophy. Cambridge: Cambridge University Press. p. 47.ISBN 9780521250283.
• Craig, Edward (1998). "Dialectical School".Routledge Encyclopedia of Philosophy.ISBN 978-0415073103.

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