noun
multiple citizenship; dual nationality
Refers to the legal status of holding citizenship in more than one country. Often discussed in contexts of nationality law and international relations.
日本では多重国籍が認められていない。
Multiple citizenship is not recognized in Japan.
彼は多重国籍を持つため、複数のパスポートを所持している。
Because he has multiple citizenship, he holds several passports.
二重国籍 specifically means dual citizenship (two countries), while 多重国籍 is a broader term for multiple citizenship (three or more).
Compound of 多重 (multiple) + 国籍 (nationality).