- Having common characteristics; being of the same kind, or in the same group
- A member of a literary or scientific society; as, a Fellow of the Royal Society.
- (obsolete) A colleague or partner.
- An equal in power, rank, character, etc.
- (rare) A person; an individual, male or female.
- In an American college or university, a member of the corporation which manages its business interests; also, a graduate appointed to a fellowship, who receives the income of the foundation.
- In the US and Canada, a physician who is undergoing a supervised, sub-specialty medical training (fellowship) after completing a specialty training program (residency).
- A man without good breeding or worth; an ignoble or mean man.
- (colloquial) A male person; a man.
- In the English universities, a scholar who is appointed to a foundation called a fellowship, which gives a title to certain perquisites and privileges.
- The most senior rank or title one can achieve on a technical career in certain companies (though some Fellows also hold business titles such as Vice President or Chief Technology Officer). This is typically found in large corporations in research and development-intensive industries (IBM or Sun Microsystems in information technology, and Boston Scientific in Medical Devices for example). They appoint a small number of senior scientists and engineers as Fellows.
- (archaic) A companion; a comrade.
- One of a pair, or of two things used together or suited to each other; a mate.
- (heading) A rank or title in the professional world, usually given as "Fellow".
- To suit with; to pair with; to match.