(BrE also naturalise) verb [usuallypassive]
1 [VN] to make sb who was not born in a particular country a citizen of that country:
a naturalized American who was born in Poland * He was naturalized as a British citizen in 1940.
2 [VN] to introduce a plant or an animal to a country where it is not native:
The grey squirrel is now naturalized in Britain.
3 [V] (of a plant or an animal) to start growing or living naturally in a country where is it not native
naturalization, naturalisation noun [U]:
naturalization papers (= documents that prove a person has been made a citizen of a country)
