Meaning of “alias” in the English Dictionary

"alias" in British English

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uk /ˈeɪ.li.əs/ us /ˈeɪ.li.əs/

used when giving the name that a person is generally known by, after giving their real name:

Malcolm Little, alias Malcolm X

aliasnoun [ C ]

uk /ˈeɪ.li.əs/ us /ˈeɪ.li.əs/

a false name, especially one used by a criminal:

He travels under (= using) an alias.

(Definition of “alias” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"alias" in American English

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aliasadverb, noun [ C ]

us /ˈeɪ·li·əs/

a false name that someone is known by:

He admitted that the name Rupert Sharp was an alias.
Paul Sopworth, alias (= also known as) Rupert Sharp, went to prison today.

(Definition of “alias” from the Cambridge Academic Content Dictionary © Cambridge University Press)