a teaching/research 'fellow' [=a graduate student who gets money in exchange for teaching/research]
He attended the concert with a 'fellow' student. [=someone who is a student, as he is]
He has always tried to be of service to 'his fellow man'. [=to other people]
(..) Don't you want to know why? OK, why? On account of the payroll thieves, fellow citizens. You see, every mine around gets its payroll from La Paz. And every (..)1969 Butch Cassidy and the Sundance Kid