Definition of username in English:

username

Syllabification: us·er·name
Pronunciation: /ˈyo͞ozərˌnām
 
/

noun

  • An identification used by a person with access to a computer, network, or online service.
    More example sentences
    • Paid access informational sites have usernames and passwords, which travel with you as you go from page to page.
    • Anyone who knows my username and password can access resources intended for me, even if they're not really me.
    • One cannot expect that ordinary users have different usernames, passwords and e-mail addresses for all of the Web sites that they visit.

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