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association; club; fan club; supporter's association
友の会の会費は年間五千円だ。
The annual membership fee for the association is 5,000 yen.
その作家の友の会が読書会を毎月開いている。
The author's fan association holds a reading group every month.
美術館の友の会に入会すると展覧会が無料になる。
Joining the museum's friends' association gets you free admission to exhibitions.