noun
multiple citizenship holder; dual national; dual citizen
Legal and administrative term for a person who holds citizenship in more than one country. Often used in discussions of dual nationality.
日本では重国籍者は二十二歳までに国籍を選択しなければならない。
In Japan, dual nationals must choose their nationality by age 22.
彼はアメリカと日本の重国籍者だ。
He is a dual citizen of the United States and Japan.
Compound of 重 (multiple) + 国籍 (nationality) + 者 (person). A modern legal term.