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]
(..) You are instructed to bring in a verdict, - Here comes the chief, - Everybody, get ready, (clearing throats) ♪ For he's a jolly good fellow ♪ ♪ For he's a jolly good fellow ♪ ♪ For he's a jolly good fellow ♪ ♪ Which nobody can deny ♪ Happy birthday! Speech! (..)1994 The Glass Shield
(..) Massey wants you, Who's ahead? Certainly not you, Jesse, (knock on door) Deputy, you endangered the lives of your fellow officers, You were assigned to watch the back of a building, There was a burglary in progress, I thought we had captured the suspect, (..)1994 The Glass Shield