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a boy or man;
"that chap is your host"
"there's a fellow at the door"
"he's a likable cuss"
"he's a good bloke"
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a friend who is frequently in the company of another;
"drinking companions"
"comrades in arms"
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a person who is member of one's class or profession;
"the surgeon consulted his colleagues"
"he sent e-mail to his fellow hackers"
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one of a pair;
"he lost the mate to his shoe"
"one eye was blue but its fellow was brown"
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a member of a learned society;
"he was elected a fellow of the American Physiological Association"
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an informal form of address for a man;
"Say, fellow, what are you doing?"
"Hey buster, what's up?"
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a man who is the lover of a girl or young woman;
"if I'd known he was her boyfriend I wouldn't have asked"