v. (also -ise) 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. naturalization n.
[ F naturaliser (as NATURAL) ]