This is a newly expanded and updated edition of one of the best-selling introductions to linguistic morphology - the study and description of word formations in languages - that deals with inflection, derivation, and compounding, the system of word-forming elements and processes in a language. Basic concepts are introduced, with an abundance of examples from a range of familiar and exotic languages, followed by a discussion of, among other topics, the definition of word-form, productivity, inflection versus derivation, and the position of morphology to phonology - the science of speech sounds, especially the history and theory of sound changes in a language. Along with two new chapters discussing morphology and the brain and how morphology arises, changes, and disappears, this new edition includes exercises and a glossary of key terms.