() or () is a regional phonological feature of the Polish language. It consists of the merger of the series of retroflex sibilants and palatal sibilants into a phonetically-intermediate series , , , (sometimes written )."Jabłonkowanie." In: Stanisław Dubisz, Halina Karaś, Nijola Kolis, Dialekty i gwary polskie. Wyd. I. Warszawa: Wiedza Powszechna, 1995, p. 62. .
It is named after the of Polish (named after the town of Jabłonków in Cieszyn Silesia). It occurs in a number of other Polish subdialects.
The feature is linked to the process of dispalatalization (reducing of the number of palatalized consonants) similar to the phenomena of and in other dialects.
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