Abstract
The notion of ‘erosion’, a universal diachronic process affecting the phonetic content of certain language forms, has held a place in historical linguistics for almost two centuries now. Recently it has been argued that the erosion of high frequency words can be derived as a consequence of normal language use within a theory of phonology based on exemplars. Focusing on discrete changes to function words, this paper argues that types of erosion exist which cannot be derived in this manner. Instead, erosion as well as other less celebrated, but well attested, irregular changes to function words can be accounted for by a species of paradigm levelling. Prosodic paradigm levelling (PPL) is much like its familiar morphological cousin only it plays out over paradigms whose cells contain word forms selected for by prosodic, not morphological, features. While PPL can account for data which exemplar models cannot, it is maintained nevertheless that exemplar models can offer a reasonable account of much of the data, provided that the model incorporates a discrete level of phonological representation, in addition to exemplars. Arguments presented have implications for phonological representation in general, as well as for the explanation of discrete, irregular change to function words.