This is the first systematic analysis of Aristotle's concept of lexis. Ana Kotarcic argues that it should be approached on three interconnected levels: the first dealing with language as a system, the second with actual language usage, into which sociolinguistic factors come into play, and the third with prescriptions for the kind of language to be used in poetic and rhetorical compositions. She introduces ideas and concepts from classics and modern linguistics into the analysis alongside the philosophical approaches which have prevailed until now. The results reveal that Aristotle's ideas on lexis are complex, well-developed and intimately connected to many other fundamental concepts in his works, such as aret?, energeia, ?thos, logos, mim?sis, pathos, phantasia and techn?. A major component of his thought is therefore illuminated comprehensively for the first time. Book Description Divides Aristotle's concept of lexis into three interconnected levels, exposing numerous valuable statements on language and style. About the Author ANA KOTARCIC is an FWO [Pegasus]2 Marie Sk?odowska-Curie Postdoctoral Fellow in the Department of Comparative, Historical and Applied Linguistics at the Katholieke Universiteit Leuven, working on Aristotle's thoughts on language as a dynamic system. Her research focuses on the workings of natural language and includes theoretical, cognitive and computational linguistics, sociolinguistics, syntax and semantics.