username
noun
us·er·name
ˈyü-zər-ˌnām 
variants
or less commonly user name
plural usernames also user names
: a sequence of characters that identifies a user (such as on a computer system, website, or social media platform)
Never reuse a username and password combination. While doing so is convenient, if that combination is ever stolen from one service you use … it will expose every service you have that uses it.—
Rachel Cericola
Rachel CericolaThese e-mail addresses generally look like this: "username@location.xxx".—Walter S. Mossberg
Walter S. Mossbergcalled also user ID
Examples of username in a Sentence
Recent Examples on the Web
This malware secretly collects usernames, passwords and website logins from infected devices.
—Kurt Knutsson, FOXNews.com, 30 Oct. 2025
In a viral TikTok video shared in October by 29-year-old Alyssa Redwine under the username @alyssaredwine, the tabby cat, Sis, can be seen standing by her best friend Mama’s side, gently tapping her on the head and watching her in pain, even leaning in for one last kiss goodbye.
—Maria Azzurra Volpe, MSNBC Newsweek, 27 Oct. 2025
Back in 2023, it was reported to be selling some usernames for as high as $50,000.
—PC Magazine, 20 Oct. 2025
That same day, Pagan sent the username and password for the shell company to Costanzo via electronic message.
—Jay Weaver, Miami Herald, 13 Oct. 2025
See All Example Sentences for username
Examples are automatically compiled from online sources to
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Kurt Knutsson, FOXNews.com, 30 Oct. 2025
In a viral TikTok video shared in October by 29-year-old Alyssa Redwine under the username @alyssaredwine, the tabby cat, Sis, can be seen standing by her best friend Mama’s side, gently tapping her on the head and watching her in pain, even leaning in for one last kiss goodbye.
—Maria Azzurra Volpe, MSNBC Newsweek, 27 Oct. 2025
Back in 2023, it was reported to be selling some usernames for as high as $50,000.
—PC Magazine, 20 Oct. 2025
That same day, Pagan sent the username and password for the shell company to Costanzo via electronic message.
—Jay Weaver, Miami Herald, 13 Oct. 2025
See All Example Sentences for username
Cite this Entry
“Username.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/username. Accessed 3 Nov. 2025.
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