fraternity
frəˈtɜːnɪəti noun
1
the teaching/scientific/criminal etc fraternity
all the people who work in a particular profession or share a particular interest 教育界同人/科学界同人/犯罪团伙等
3 a feeling of friendship between members of a group [正式] 〔团体成员间的〕情谊,兄弟般友谊 U | formal
国与国之间的情谊