To grant citizenship to someone not born a citizen. / To acclimatize an animal or plant. / To make natural / To limit explanations of a phenomenon to naturalistic ones and exclude supernatural ones.

present participle of naturalize

simple past tense and past participle of nature

(in combination) Having or possessing the specified disposition or temperament.

plural of naturalization

present participle of naturize

(obsolete, transitive) To endow with a nature or qualities; to refer to nature.

simple past tense and past participle of naturize

(dialect) natural

plural of naturalism