naturalization
[ˈnætʃərələˈzeʃən]
n.
（外国人的）归化;
（动植物的）移植;
（外国的习惯、语言等的）移入;
同化;
例句:
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They swore their allegiance to the USA and received their naturalization papers.
他们起誓忠诚于美国，随后就接到了批准他们入籍的文件。
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It was this man who pulled strings for Will to get his naturalization.
就是这个人为威利幕后拉线,搞到了他的国籍证明.
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Naturalization Class — Assists immigrants in preparing for their naturalization exam.
入籍班—协助移民准备入籍考试.
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On Flag Day every June, roughly 100 immigrants swear oaths of citizenship at a naturalization ceremony held in an UNO gymnasium.
来自WSJ