Language demonstrates structure while also showing considerable variation at all levels: languages differ from one another while still being shaped by the same principles; utterances within a language differ from one another while exhibiting the same structural patterns; languages change over time, but in fairly regular ways. This book focuses on the dynamic processes that create languages and give them their structure and variance. It outlines a theory of language that addresses the nature of grammar, taking into account its variance and gradience, and seeks explanation in terms of the recurrent processes that operate in language use. The evidence is based on the study of large corpora of spoken and written language, what we know about how languages change, as well as the results of experiments with language users. The result is an integrated theory of language use and language change which has implications for cognitive processing and language evolution.

A usage-based view takes grammar to be the cognitive organization of one's experience with language. Aspects of that experience, for instance, the frequency of use of certain constructions or particular instances of constructions, have an impact on representation that is evidenced in speaker knowledge of conventionalized phrases and in language variation and change. It is shown that particular instances of constructions can acquire their own pragmatic, semantic, and phonological characteristics. In addition, it is argued that high-frequency instances of constructions undergo grammaticization processes (which produce further change), function as the central members of categories formed by constructions, and retain their old forms longer than lower-frequency instances under the pressure of newer formations. An exemplar model that accommodates both phonological and semantic representation is elaborated to describe the data considered.

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This book essentially argues for the importance of word frequency as a factor in the analysis and explanation of language structure. In other words, the roles of words and other linguistic phenomena such as morphology, phonology, and syntax are highly influenced by low, medium, or high frequency with which they occur. The book includes three decades of influential research in one thematic source. It provides an introductory overview that traces the development of thinking on this important subject. The discussion covers word frequency in lexical diffusion, morphophonemics, lexical and morphological conditioning of alternations using Spanish verbs as example, rules and schemas in the development and use of the English past tense, morphological classes as natural categories, regular morphology and lexicon, sequentiality as the basis of constituent structure, and mechanisms of change in grammaticization.