Syncretism - where a single form serves two or more morphosyntactic functions - is a persistent problem at the syntax-morphology interface. It results from a 'mismatch' whereby the syntax of a language makes a particular distinction but the morphology does not. This pioneering book provides a full-length study of inflectional syncretism, presenting a typology of its occurrence across a wide range of languages. The implications of syncretism for the syntax-morphology interface have long been recognised: it argues either for an enriched model of feature structure (thereby preserving a direct link between function and form), or for the independence of morphological structure from syntactic structure. This book presents a compelling argument for the autonomy of morphology and the resulting analysis is illustrated in a series of formal case studies within Network Morphology. It will be welcomed by all linguists interested in the relation between words and the larger units of which they are a part.

We examine the notion of '(inflectional) periphrasis' within the framework of Canonical Typology, and argue that the canonical approach allows us to define a logically coherent notion of periphrasis. We propose a set of canonical criteria for inflectional morphology and a set of canonical criteria for functional syntax, that is, syntactic constructions which include functional elements and which express grammatical features. We argue that canonical periphrasis is exemplified in our theoretical space of possibilities whenever a cell in a (canonically morphological) inflectional paradigm ('feature intersection') is expressed by a multiword construction which respects the canonical properties of functional syntax. We compare our canonically-based approach with the approach of other authors, notably, Ackerman & Stump (2004), who argue for three sufficient conditions for a construction to be regarded as periphrastic: feature intersection, non-compositionality and distributed exponence. We argue that non-compositionality and distributed exponence, while sometimes diagnostic of periphrasis on a language-particular basis, do not constitute canonical properties of periphrasis. We also examine crucial but neglected syntactic aspects of periphrastic constructions: recursion of periphrases and headedness of periphrastic constructions. The approach we propose allows us to distinguish between constructions in actual languages which approximate the ideal of canonical periphrasis to various degrees without committing us to a categorical distinction between periphrastic and non-periphrastic constructions. At the same time we can capture the intuition that there is in some languages a distinct identifiable set of multiword constructions whose principal role is to realize grammatical features.

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Suppletion is where the word-forms of the same lexeme have phonologically distinct stems. A study of thirty languages shows it to be surprisingly widespread, suggesting resistance to the pressure of paradigmatic levelling. While a major factor in its preservation appears to be the high frequency of the items that display it, two other factors are in operation, the type of inflectional category involved and the nature of the distribution of stems.

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