1. to grant citizenship to someone born in another country
Usage: British spelling
2. to introduce and establish a plant or animal in a region where it is not native
Usage: British spelling; biology
3. to adopt or absorb into a culture so as to make natural or familiar
Usage: British spelling

Examples

• After living in Britain for ten years, she decided to naturalise as a British citizen.
• The government naturalised thousands of immigrants last year.
• Japanese knotweed has naturalised in many parts of Europe.
• These wildflowers have naturalised along the riverbank.
• The restaurant naturalised several foreign dishes into local cuisine.
• Foreign words often naturalise into English over time.