This book presents a comprehensive, data-rich, theory-neutral description of English word formation, including inflection and derivation, compounding, conversion, and such minor processes as subtractive morphology. It also offers analyses of the theoretical challenges these phenomena present. It is the first to make systematic use of large linguistic corpora, including the Corpus of Contemporary American English, the British National Corpus, and the American National Corpus by which, for example, the authors are able to measure the productivity of different patterns and to trace semantic developments as they happen.