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English definition of “username”

username

noun [C]     /ˈjuːzəneɪm/ (also user ID)
IT a name or other information that you enter, usually with a password (= a secret word, or series of letters and numbers) in order to use a computer system, website, etc.: We will send you your username and password in separate emails. → Compare log-in
(Definition of username noun from the Cambridge Business English Dictionary © Cambridge University Press)
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