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Wiktionary
nativization

alt. (context linguistics English) The process whereby a language acquires native speakers. n. (context linguistics English) The process whereby a language acquires native speakers.

Wikipedia
Nativization

Nativization is the process whereby a language gains native speakers. This happens necessarily where a second language used by adult parents becomes the native language of their children. Nativization has been of particular interest to linguists, and to creolists more specifically, where the second language concerned is a pidgin.

Several explanations of creole genesis have relied on prior nativization of a pidgin as a stage in achieving creoleness. This is true for Hall's (1966) notion of the pidgin-creole life cycle as well as Bickerton's language bioprogram theory.

There are few undisputed examples of a creole arising from nativization of a pidgin by children. The Tok Pisin language reported by is one example where such a conclusion could be reached by scientific observation. A counterexample is the case where children of Gastarbeiter parents speaking pidgin German acquired German seamlessly without creolization. Broad treatments of creolization phenomena such as acknowledge now as a matter of standard that the pidgin-nativization scheme is only one of many explanations with possible theoretical validity.