Abstract Contemporary Kurdish variety groups exhibit considerable variation with respect to the lenition of voiced stops. This paper presents a first systematic overview of lenition across major varieties of Kurdish, drawing on published data and a recent questionnaire developed for studying phonological variation within Kurdish. Following recent studies on lenition, a distinction is made between lenition as a process related to earlier stages of language and lenition as a synchronically active process. Analysing diachronic sound changes in Kurdish as well as the synchronic lenition phenomena in its dialects, we conclude that while at earlier stages, Kurdish varieties favoured the lenition of voiced stops across different phonological environments, synchronically, lenition of voiced stops tends to be phonologically active only in the southernmost dialects of Central Kurdish and neighbouring Southern Kurdish and Gorani dialects, and with a limited extent, in the westernmost outliers of Northern Kurdish. It is argued that the synchronic lenition in the Gorani contact zone arose through innovation in Gorani and spread to Kurdish through substratum interference or originated in diffusion from Southern Kurdish.
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