Meaning of “pseudonym” in the English Dictionary

"pseudonym" in British English

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pseudonymnoun [ C ]

uk /ˈsjuː.də.nɪm/ us /ˈsuː.də.nɪm/

a name someone uses instead of their real name, especially on a written work:

She writes under a pseudonym.
George Orwell was a pseudonym - his real name was Eric Blair.
adjective uk /sjuːˈdɒn.ɪ.məs/ us /suːˈdɑː.nə.məs/ formal

pseudonymous literature

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

"pseudonym" in American English

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pseudonymnoun [ C ]

us /ˈsu·dənˌɪm/

a name that someone uses instead of his or her real name, esp. on a written work:

Samuel Clemens used the pseudonym Mark Twain.

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