enroll, domiciliary register, membership
籍 centers on being formally recorded in a list or register: enrolling in a group, holding membership, or having one's name in an official domiciliary register.
籍 combines 竹 (bamboo) with 耤, which likely contributes the sound. Historically, bamboo strips were used for writing records, so 竹 suggests a written register or list.
The top 竹 represents bamboo slips used for record-keeping. The bottom 耤 looks like a complex ledger. Together, they show a bamboo register where names are enrolled.
For セキ, imagine a secretary (セキ) carefully writing your name in the bamboo register: secretary -> セキ, and you are now enrolled.
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book; publication
nationality; citizenship
being enrolled (at a school); being registered; being a member (of a team, organization, etc.)
transfer (of one's name into another family register)
one's family register; one's domicile
family register
registering (a marriage, etc.) in the family register
one's registered domicile (as recorded in the family register); one's legal domicile (as opposed to where one lives)
removing a name
ship's nationality; ship's country of registration
transfer of permanent domicile (as recorded in the family register)
necrology; roster of the dead
Chinese book; Chinese classics
school register
books; writings
land register
digital book; electronic book; e-book
dual nationality; dual citizenship
dual citizen; person having dual citizenship or nationality
flag-of-convenience ship; ship flying a flag of convenience