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]
(..) to go into your theory. Time is of no importance. Only life is important. Right! And we're going to protect the life of billion of our fellow citizens. You may fire. Upfront loading of a -ZR missile. Marker lights on the objective. lts structure has solidified. lt's anticipating the attack. (..)1997 The Fifth Element