Mazurzenie (Polish pronunciation: [mazuˈʐɛɲɛ]) or mazuration is the replacement or merger of Polish's series of retroflex fricatives and affricates /ʂ, ʐ, t͡ʂ, d͡ʐ/ (written ‹sz›, ‹ż›, ‹cz›, ‹dż›) into the alveolar series /s, z, t͡s, d͡z/ (written ‹s›, ‹z›, ‹c›, ‹dz›). This merger is present in many dialects, but is named for the dialect of Masuria.[1]
This phonological feature is observed in dialects of Masuria and Masovia, as well as in parts of Lesser Poland and Northern Silesia, and on the periphery of Greater Poland.
The boundary of mazurzenie runs from north-east to south-west.[1]
A similar phenomenon, Tsokanye, has been observed in the Old Novgorod dialect of Old East Slavic. It also occurs in a few areas of the Chakavian dialect of Croatian, known as tsakavism.