One who is a member of an elite group of advanced and/or learned academics, professionals, or craftspeople focused on advancing the cause of their common interest(s).
The word "fellow" has been derived from Old Norse fēlagi, implying "a partner or shareholder of any kind." Simply put, a fellow means someone who is an equal or is a companion. Theoretically put, a fellow in academic parlance refers to an elite group of scholars or learned people who work together in pursuit of knowledge. There is no one way of using the title, and every academic institution grants the title in a manner it deems fit.
Fellow as a title is used to refer to someone who is holding office of a temporary academic post. Such a person has less teaching duties as most of his time is dedicated to learning and research. The title "Research Fellow" may also pertain to a young researcher in receipt of a fellowship conferred by an external body like the Research Council or the Royal Society in the UK or the NIH in the US.
Fellow as a title is used to refer to someone who is holding office of a temporary academic post. Such a person has less teaching duties as most of his time is dedicated to learning and research. The title "Research Fellow" may also pertain to a young researcher in receipt of a fellowship conferred by an external body like the Research Council or the Royal Society in the UK or the NIH in the US.
Somebody who is partner someone.