us·​er·​name ˈyü-zər-ˌnām How to pronounce username (audio)
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
These e-mail addresses generally look like this: "".Walter S. Mossberg

called also user ID

Examples of username in a Sentence

Recent Examples on the Web Other pieces of information that could have been compromised are IP addresses, account usernames, and data on how members used the Kaiser website. Karen Garcia, Los Angeles Times, 2 May 2024 Ultimately, the law is looking to prevent incidents like the Mirai botnet DDoS attack in 2016, which used a short list of 62 common default usernames and passwords to scan for vulnerable devices and ensnared nearly 300,000 devices. Joe Hindy, PCMAG, 30 Apr. 2024 Advertisement There were no usernames, passwords, Social Security numbers, financial account information, or credit card numbers shared with those platforms, the company said. Nathan Solis, Los Angeles Times, 26 Apr. 2024 Use multi-factor authentication Most major websites now support multi-factor or two-step authentication, which requires not only a username and password but additional assurances that a user is the rightful account holder. Brian Fung, CNN, 13 Apr. 2024 Instead, the company said, login credentials used in the hacks were likely stolen from another source for which the affected users may have used the same username and password. Lucia Suarez Sang, CBS News, 12 Apr. 2024 But Chen says the company does not track personal data or link usernames to the emails. Ryan MacAsero, The Mercury News, 18 Mar. 2024 The perpetrators of com's and 764's abuse have for years operated behind the masks of usernames and profile pictures. Ali Winston, WIRED, 13 Mar. 2024 Previously, One users needed a username and password and a verification code sent by text message. Craig Silverman, ProPublica, 11 Mar. 2024

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'username.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1971, in the meaning defined above

Time Traveler
The first known use of username was in 1971

Dictionary Entries Near username

Cite this Entry

“Username.” Dictionary, Merriam-Webster, Accessed 18 May. 2024.

Kids Definition


: a sequence of characters that identifies a user when logging onto a computer or website

called also user ID

More from Merriam-Webster on username

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