naturalization
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/ˌnætʃrələˈzeɪʃn/
🇬🇧
/ˌnætʃrəlaɪˈzeɪʃn/
The process of becoming a legal citizen of a country where you were not born.
She went through the naturalization process to become a US citizen.
The process of a non-native plant or animal becoming established in a new environment.
The naturalization of this exotic plant has caused an ecological imbalance in the area.