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]
(..) is business. Our democracy is one of the brightest lights of social justice in the history of humankind, and yet most of our fellow citizens engage in frenzied shopping as their primary form of social interaction. Come on down! Let's go shopping! These prices are insane! (..)2016 Captain Fantastic