verb

• 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.
• (linguistics) To make (a word) a natural part of the language, using the native homologue of each phoneme (and often for each morpheme) of the imported word (e.g., native inflections).
• To study nature.