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]
(..) Wear that! Nothing modest or matronly will do for this occasion. And put on plenty of rouge. I want you to look your part tonight. "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 "Which nobody can deny Which nobody can deny (..)1939 Gone with the Wind
(..) Come on, Beau. We must leave this gentleman alone because he's tired and he's hungry. I don't mind, ma'am. Good to see a youngster again. Nice little fellow. Another two years of war and we could have had him with us in Cobb's Legion. Were you in Cobb's Legion? Yes, ma'am. (..)1939 Gone with the Wind