Webster's English Dictionary

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fraternity

fra.ter.ni.ty \fr*-'t*r-n*t-e-\ n 1: a group of people associated or 
   formally organized for a common purpose,  interest, or pleasure : as 1a: a 
   fraternal order  1b: GUILD  1c: a student organization formed chiefly for 
   social purposes having secret  rites and a name consisting of Greek letters 
   2: the quality or state of being brothers : BROTHERLINESS  3: men of the 
   same class, profession, character, or tastes  4a: the entire progeny of a 
   single mating  4b: a group of siblings