naturalization
US /ˌnætʃ.ɚ.rə.ləˈzeɪ.ʃən/
UK /ˌnætʃ.ɚ.rə.ləˈzeɪ.ʃən/

1.
naturalisation
the process by which an immigrant becomes a citizen of a new country
:
•
The ceremony for naturalization was held last week.
La cérémonie de naturalisation a eu lieu la semaine dernière.
•
He completed all the requirements for naturalization.
Il a rempli toutes les conditions de naturalisation.