1 tr. admit (a foreigner) to the citizenship of a country.
2 tr. introduce (an animal, plant, etc.) into another region so that it flourishes in the wild.
3 tr. adopt (a foreign word, custom, etc.).
4 intr. become naturalized.
5 tr. Philos. exclude from the miraculous; explain naturalistically.
6 tr. free from conventions; make natural.
7 tr. cause to appear natural.
8 intr. study natural history.
Derivatives:
naturalization n.
Etymology: F naturaliser (as NATURAL)
Useful english dictionary. 2012.