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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’).
A model of grammar needs to reconcile the undesirability inherent to allomorphy, the apparent extra burden on learning and memory, with its occurrence and possible stability. OT approaches this task by positing an anti-allomorphy constraint, henceforth referred to as "OO-correspondence", which requires leveling (i.e. sameness of sound structure) in related word forms (Benua 1997). The occurrence of allomorphy then indicates crucial domination of OO-correspondence by other constraints. To assess the adequacy of this proposal it is necessary to establish the level of abstractness at which OO-correspondence applies and to examine the consequences of this decision for ranking order. While proponents of OT tacitly assume the level in question to be rather concrete, the notion of allomorphy as originally envisioned in Structuralism was defined by distinctness at a more abstract level referred to as "phonemic" (Harris 1942; Nida 1944). The basic intuition here is that the defining property of subphonemic sound properties, their conditionedness by context, entails that whatever burden they put on learning and memory is of a fundamentally different nature than that entailed by phonemic distinctness. The evidence from German supports that intuition in that leveling can be shown to target phonemic sound structure to the exclusion of subphonemic properties. Allomorphy, defined by phonemic alterna-tion, tends to serve phonological optimization in closed class items (function words, affixes) while serving to express morphological distinctions in open class items. The key to demonstrating the correlations in question lies in the discernment of phonemic structure, which is therefore at the core of the article.