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fraternity  (fraternities plural )
1  n-uncount Fraternity refers to friendship and support between people who feel they are closely linked to each other. 
FORMAL Bob needs the fraternity of others who share his mission.  
2  n-count You can refer to people who have the same profession or the same interests as a particular fraternity. 
usu supp N  (=set) 
...the spread of stolen guns among the criminal fraternity., ...the sailing fraternity.  
3  n-count In the United States, a fraternity is a society of male university or college students. 

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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"