expression, ichidan verb
register a marriage; enter one's name in the family register
Refers to the legal act of registering a marriage in Japan's family register (koseki). Often used as a synonym for getting married officially, as opposed to just having a ceremony.
See also: 籍に入れる (せきにいれる)
二人は先月籍を入れた。
They registered their marriage last month.
結婚式
We haven't had the wedding ceremony yet, but we've already registered our marriage.