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Morphophonological asymmetries in affixation concern systematic correlations between morphological properties of affixes (e.g. combination with bound versus free stems, position relative to stem (suffixes versus prefixes)) and their phonological properties (e.g. stress behaviour). The arguably most insightful approach to capturing relevant asymmetries invokes a notion of affix coherence, first introduced by Dixon in connection with his work on Yidiɲ, a nearly extinct language spoken in Northern Australia. This notion is based on a categorical division of affixes into ones that integrate into the phonological word of the stem and ones that do not. The integration of affixes is envisioned as being fully determined by phonological and morphological structure in a given language and verifiable by diagnostics relevant to phonological word domains (primarily the syllable and the foot structure). The assumption of two types of prosodic domains characterized by integrated versus non-integrated affixes is manifest in consistent asymmetries that pertain to morphophonological, phonological, and phonetic rules. This consistency constitutes compelling evidence for the structure-based analysis of the impact of various affixes on derived words, as opposed to alternative approaches to capturing these effects by associating affixes with diacritics (morpheme versus word boundary, class 1 versus class 2, stratum 1 versus stratum 2). The present entry aims to demonstrate, mostly on the basis of data from Germanic languages, the breadth of the empirical evidence in support of a fundamental role of affix coherence. Moreover, it aims to draw attention to the various implications of affix coherence for modeling relevant generalizations, in particular the necessary reference to a level of phonological representation characterized by a specific degree of abstractness (‘phonemic’).
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