To grant citizenship to (a foreign national); admit to the citizenship of a country. The government agreed to naturalize the refugees after the war.
To introduce and acclimate (a plant, animal, or other organism) to a new environment so that it lives and reproduces there as if it were native. Botanists have successfully naturalized the exotic bamboo species in the local forest.
To make something appear more natural, lifelike, or in keeping with natural conditions. The engineer adjusted the lighting to naturalize the virtual scene.
(intransitive) To acquire citizenship in a country; become naturalized. After ten years of residency, she naturalized and obtained an Irish passport.