a man or boy: a fine old fellow; a nice little fellow.
2.
Informal. beau; suitor: Mary had her fellow over to meet her folks.
3.
Informal. person; one: They don't treat a fellow very well here.
4.
a person of small worth or no esteem.
5.
a companion; comrade; associate: They have been fellows since childhood.
6.
a person belonging to the same rank or class; equal; peer: The doctor conferred with his fellows.
7.
one of a pair; mate; match: a shoe without its fellow.
8.
Education.
a.
a graduate student of a university or college to whom an allowance is granted for special study.
b.
British. an incorporated member of a college, entitled to certain privileges.
c.
a member of the corporation or board of trustees of certain universities or colleges.
9.
a member of any of certain learned societies: a fellow of the British Academy.
10.
Obsolete. a partner.
–verb (used with object)
11.
to make or represent as equal with another.
12.
Archaic. to produce a fellow to; match.
–adjective
13.
belonging to the same class or group; united by the same occupation, interests, etc.; being in the same condition: fellow students; fellow sufferers.
Origin: bef. 1050; ME felowe, felawe, late OE fēolaga < ON fēlagi partner in a joint undertaking, equiv. to fē money, property (c. OE feoh, G Vieh) + -lagi bedfellow, comrade; akin to lair1, lie2
A person of equal rank, position, or background; a peer.
One of a pair; a mate: found the lost shoe and its fellow.
An incorporated senior member of certain colleges and universities.
A member of the governing body of certain colleges and universities.
A comrade or associate.
A person of equal rank, position, or background; a peer.
One of a pair; a mate: found the lost shoe and its fellow.
An incorporated senior member of certain colleges and universities.
A member of the governing body of certain colleges and universities.
A member of a learned society.
A graduate student appointed to a position granting financial aid and providing for further study.
Chiefly British
An incorporated senior member of certain colleges and universities.
A member of the governing body of certain colleges and universities.
Obsolete A person of a lower social class.
adj. Being of the same kind, group, occupation, society, or locality; having in common certain characteristics or interests: fellow workers.
[Middle English felau, from Old English fēolaga, from Old Norse fēlagi, business partner, fellow, from fēlag, partnership : fē, property, money; see peku- in Indo-European roots + lag, a laying down; see legh- in Indo-European roots.]
Word History: A jolly good fellow might or might not be the ideal business associate, but the ancestor of our word fellow definitely referred to a business partner. Fellow was borrowed into English from Old Norse fēlagi, meaning "a partner or shareholder of any kind." Old Norse fēlagi is derived from fēlag, "partnership," a compound made up of fē, "livestock, property, money," and lag, "a laying in order" and "fellowship." The notion of putting one's property together lies behind the senses of fēlagi meaning "partner" and "consort." In Old Icelandic fēlagi also had the general sense "fellow, mate, comrade," which fellow has as well, indicating perhaps that most partnerships turned out all right for speakers of Old Icelandic.
Main Entry: fel·low Pronunciation: 'fel-(")O, -&(-w) Function: noun : a young physician who has completed training as an intern and resident andhas been granted a stipend and position allowing him or her to do further study or research in a specialty
[fel-oh] 
oʊ