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
Data accessed by the hacking group included information like usernames, email addresses, course names, enrollment information and messages, according to Instructure.
—Rebekah Riess, CNN Money, 12 May 2026
Muneeb had been assembling usernames and passwords—5,400 of them taken from his own company’s network data.
—Nate Anderson, ArsTechnica, 12 May 2026
His username was Butlerian Jihadist, a reference to a human rebellion against machines in Dune.
—Lorena O’Neil, Rolling Stone, 11 May 2026
Beyer, who streams on Twitch under the username Central_Committee, is from Pennsylvania and recently moved to Los Angeles.
—Los Angeles Times, 1 May 2026
See All Example Sentences for username
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Rebekah Riess, CNN Money, 12 May 2026
Muneeb had been assembling usernames and passwords—5,400 of them taken from his own company’s network data.
—Nate Anderson, ArsTechnica, 12 May 2026
His username was Butlerian Jihadist, a reference to a human rebellion against machines in Dune.
—Lorena O’Neil, Rolling Stone, 11 May 2026
Beyer, who streams on Twitch under the username Central_Committee, is from Pennsylvania and recently moved to Los Angeles.
—Los Angeles Times, 1 May 2026
See All Example Sentences for username
Cite this Entry
“Username.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/username. Accessed 14 May. 2026.
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