This book shows how complex words and word-like phrasal lexical units can be analysed as constructions, as pairings of forms and meanings. It contributes to current work on the architecture of the grammar, the morphology-syntax interface, the shape and characteristics of the lexicon, and the analysis of grammaticalization phenomena. It is an important work for morphological theory in particular and for linguistic theory in general. Geert Booij applies the insights of construction grammar to morphological theory and the formation of words and lexical phrases. Construction grammar refers to the class of linguistic theories that focus on the pairing of form and meaning at different levels of abstraction. Such work (by William Croft and Adele Goldberg, for example) has tended to focus on syntax or (as in the case of Ray Jackendoff) on the syntax-semantics interface. Geert Booij offers a characteristically lucid integration of his own and others' work and considers what it reveals about the nature of words and idioms. His book will appeal to professional linguists in all subfields and to graduate students of syntax and morphology.