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]
(..) - What are you so happy about? - Moriarty. - What's Moriarty? - I've absolutely no idea. Sir, shall we go? Interesting, that soldier fellow. He could be the making of my brother... or make him worse than ever. Either way, we'd better upgrade their surveillance status. Grade active. (..)2010 TvShow: Sherlock Title: A Study in Pink Season: 1 Episode 1