Registering (a marriage) in the family register; officially recording a marriage or similar entry in the family registry.
来月、入籍する予定です。
We plan to register our marriage next month.
入籍の手続きは市役所で行うことが多い。
The procedure for registration is often done at the city hall.
入籍した後に姓を変えるかどうか話し合った。
We discussed whether to change our family name after registering the marriage.