Persevatory assimilation

Definition
Persevatory assimilation is a process of assimilation, it is also called 'carry-over assimilation' or 'progressive assimilation'.

Examples
In the Dutch word 'ontzettend', /z/ is pronounced as /s/ because of the voicelessness of the preceding segment: the voicelessness perseveres, or carries over, from /t/ to the next segment /z/.

Links
Utrecht Lexicon of Linguistics