This paper examines the interplay of phonological, morphological, and lexical variation focusing on adjectives in Japanese dialects. Previous studies of adjectives in the Niigata dialects of the Japanese language analyzed the ongoing changes in dialectal variation amongst the young generation of Japanese. In this paper, the data derived from the geolinguistic survey and dialect dictionaries are used to verify the estimated changes in phonological, morphological, and lexical variation. The variation of adjectives is examined by classifying forms with regard to the distinction between standard/dialectal forms. The phonological types of adjectives played a role in the interpretation of the phonological variation and change. Most changes of phonological types are phonologically explained but include change by analogy. The lexical variation is intertwined with phonological variation and morphological variation. The morphological distributions which vary according to the conjugation form are one example of lexical diffusion.
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