fellow
noun
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a man who is the lover of a girl or young womanboyfriend
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a boy or manchap
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a person who is member of one's class or professioncolleagueconfrere
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a friend who is frequently in the company of anotherfamiliar
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an informal form of address for a man“Say, fellow, what are you doing?”buster
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a member of a learned society“I was elected a fellow of the American Physiological Association.”
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one of a pairmate