noun
an additional name given to a person, especially in ancient Rome, as a nickname or an epithet
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The cognomen is an additional name given to a person, often to distinguish them from others with the same name.
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My cognomen is 'Junior' because I have the same name as my father.
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I don't really like my cognomen, but it stuck with me since high school.
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In the world of superheroes, a cognomen can be a powerful alias that represents their true identity.