noun
a false or fictitious identity
adverb
used to indicate that a named person is also known or more familiar under another specified name
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The suspect used an alias to avoid being identified by the authorities.
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I heard that John goes by the alias 'Big J' at the gym.
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Yo, have you met my friend who goes by the alias 'Slick Rick'?
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In the world of espionage, having an alias is crucial for maintaining anonymity.