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
In a viral TikTok video shared on Monday under the username @lifeaedean, the worker can be seen putting on his one remaining shoe, as a customer's dog parades his other shoe around like a trophy after stealing it from him.
—Maria Azzurra Volpe, MSNBC Newsweek, 26 June 2025
If your web browser automatically populates your username and password for you, make sure this information is free of typos.
—Kurt Knutsson, FOXNews.com, 22 June 2025
Several TikTok creators shared their Roblox usernames in their videos to encourage people to join their upcoming protests; many of them appeared to be young.
—Alyssa Mercante, Rolling Stone, 20 June 2025
An investigation found the same username recently made several other anti-LGBTQ+ posts on various social media platforms, the complaint shows.
—Silas Morgan, The Orlando Sentinel, 18 June 2025
See All Example Sentences for username
Examples are automatically compiled from online sources to
show current usage.
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Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
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Maria Azzurra Volpe, MSNBC Newsweek, 26 June 2025
If your web browser automatically populates your username and password for you, make sure this information is free of typos.
—Kurt Knutsson, FOXNews.com, 22 June 2025
Several TikTok creators shared their Roblox usernames in their videos to encourage people to join their upcoming protests; many of them appeared to be young.
—Alyssa Mercante, Rolling Stone, 20 June 2025
An investigation found the same username recently made several other anti-LGBTQ+ posts on various social media platforms, the complaint shows.
—Silas Morgan, The Orlando Sentinel, 18 June 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 4 Jul. 2025.
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