入籍

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

CEDICT

to become a naturalized citizen

Wiktionary

  1. 甲國或甲地人，改入乙國或乙地的戶籍，皆稱為「入籍」。
  2. 把名字寫在妓女登記簿上，即徵為官妓之意。反之則為「脫籍」。

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 入時 rùshí)
  4. abbr. for 入聲 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