/ ˈfeləʊ; NAmE ˈfeloʊ/ noun , adjective
■ noun
1.
( informal , becoming old-fashioned ) a way of referring to a man or boy :
He's a nice old fellow.
—see also fella
2.
[ usually pl. ] a person that you work with or that is like you; a thing that is similar to the one mentioned :
She has a very good reputation among her fellows.
Many caged birds live longer than their fellows in the wild.
3.
( BrE ) a senior member of some colleges or universities :
a fellow of New College, Oxford
4.
a member of an academic or professional organization :
a fellow of the Royal College of Surgeons
5.
( especially NAmE ) a graduate student who holds a fellowship :
a graduate fellow
a teaching fellow
■ adjective
[ only before noun ] used to describe sb who is the same as you in some way, or in the same situation :
fellow members / citizens / workers
my fellow passengers on the train
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WORD ORIGIN
late Old English fēolaga a partner or colleague (literally one who lays down money in a joint enterprise ), from Old Norse félagi , from fé cattle, property, money + the Germanic base of lay (verb and noun).