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]
(..) Hey. I see you have changed. I'm sorry? Oh, I'm sorry. I mistook you for a friend. Oh. Good-looking fellow, I'm sure. No, no, no. That's Fischer's projection of Browning. Let's follow him and see how he behaves. - Why? (..)2010 Inception