入籍

rùjí
  1. to become naturalized
  2. to become a citizen

CEDICT

to become a naturalized citizen

Wiktionary

  1. 甲国或甲地人，改入乙国或乙地的户籍，皆称为「入籍」。
  2. 把名字写在妓女登记簿上，即徵为官妓之意。反之则为「脱籍」。

重編國語辭典

Entry Composition

1 入 rù
  1. to enter; to go into
  2. to join; to become a member of
  3. (bound form) to conform to (as in 入时 rùshí)
  4. abbr. for 入声 rùshēng
  5. (on product packaging, after {number n} + {classifier}) containing (n pieces) (from Japanese 入 "iri")
2 籍 jí
  1. (bound form) book; record; register
  2. (bound form) place of one's family or ancestral records
  3. (bound form) membership