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
Anyone who possesses the right credentials (username, password, MFA) is granted broad access based on the outdated assumption that being on the network equals being trusted.
—Steve Riley, Forbes.com, 15 Sep. 2025
In a viral video shared on Instagram on Wednesday under the username @lifewithsnowdogs, the poster can be seen running in the park with her husky, Leo, who initially manages to keep up with her, but soon gets tired.
—Maria Azzurra Volpe, MSNBC Newsweek, 11 Sep. 2025
In a notice confirming the breach, Plex says an unauthorized third party had gained access to a limited set of its customer data, which includes their emails, usernames, hashed passwords, and authentication data.
—PC Magazine, 9 Sep. 2025
The best implementations of passkeys don’t even need a username.
—Jacob Roach, Wired News, 3 Sep. 2025
See All Example Sentences for username
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Steve Riley, Forbes.com, 15 Sep. 2025
In a viral video shared on Instagram on Wednesday under the username @lifewithsnowdogs, the poster can be seen running in the park with her husky, Leo, who initially manages to keep up with her, but soon gets tired.
—Maria Azzurra Volpe, MSNBC Newsweek, 11 Sep. 2025
In a notice confirming the breach, Plex says an unauthorized third party had gained access to a limited set of its customer data, which includes their emails, usernames, hashed passwords, and authentication data.
—PC Magazine, 9 Sep. 2025
The best implementations of passkeys don’t even need a username.
—Jacob Roach, Wired News, 3 Sep. 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 21 Sep. 2025.
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