PYRRHONISM Meaning of PYRRHONISM in English n.1 the philosophy of Pyrrho of Elis (c.300 BC), maintaining that certainty of knowledge is unattainable. 2 scepticism; philosophic doubt. Derivatives: Pyrrhonist n. Etymology: Gk Purrhon Pyrrho Oxford English vocab. Оксфордский английский словарь. 2012