noun
a familiar or humorous name given to a person or thing instead of or as well as the real name
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Her given name is Elizabeth, but she is commonly known by her nickname, Liz.
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Hey, what's your nickname? Mine is Jess!
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I heard his nickname is 'Ace' because he's really good at cards.
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The city's nickname as the 'Big Apple' comes from its reputation as the center of the universe.