or naturalise
■ verb
1》 admit (a foreigner) to the citizenship of a country.
↘alter (an adopted foreign word) so that it conforms more closely to the phonology or orthography of the adopting language.
2》 [usu. as adjective ~d ] Biology establish (a plant or animal) so that it lives wild in a region where it is not indigenous.
3》 regard as or cause to appear natural.
↘explain (a phenomenon) in a naturalistic way.
Derivatives
naturalization noun