fel·low / ˈfelō/ • n. 1. inf. a man or boy: he was an extremely obliging fellow.2. (usu. fellows) a person in the same position, involved in the same activity, or otherwise associated with another: he was learning with a rapidity unique among his fellows. ∎ a thing of the same kind as or otherwise associated with another: the page has been torn away from its fellows.3. a member of a learned society: he was elected a fellow of the Geological Society. ∎ (also research fellow) a student or graduate receiving a fellowship for a period of research. ∎ a member of the governing body in some universities.• adj. sharing a particular activity, quality, or condition with someone or something: fellow citizens.