Published online by Cambridge University Press: 22 April 2026
As a result of analogical change, a bundle of phonetic features may arise which occurs simultaneously only in a given morphological category. Such a segment can be accounted for by a low-level morphologically conditioned phonetic rule. A subsequent phonetic change may normalize the segment and delete the first rule from the synchronic grammar. While the diachronic grammar will include both phonetic rules, the resultant change will appear in the synchronic grammar as a change in the morphophonological structure of the underlying form. This principle is illustrated by the anomalous nasal vowel letter attested in certain Old Church Slavonic participles, and by the fate of the velar stop in adjectival and pronominal inflection in northern Russian dialects.