naturalize
US /ˈnætʃ.ɚ.rə.laɪz/
UK /ˈnætʃ.ɚ.rə.laɪz/

1.
admit (a foreigner) to the citizenship of a country
:
•
After living in the country for ten years, she decided to naturalize.
•
The government has a process to naturalize immigrants.
2.
introduce (an animal or plant) into a region where it is not indigenous
:
•
Many non-native species have been naturalized in this ecosystem.
•
Efforts are being made to naturalize the endangered plant species in new habitats.