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
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
Get a password manager Password managers store your usernames, passwords and email addresses and protect them from unauthorized access.
—David McMillin, CNBC, 8 Oct. 2025
The man, known as Tim, shared photos of the chest in a post on Reddit under username u/tenglempls in the r/ThriftStoreHauls subreddit.
—Soo Kim, MSNBC Newsweek, 3 Oct. 2025
Although the company didn’t specify the threat, POP3 can be unencrypted, allowing usernames and passwords to be sent over plain text.
—Senior Reporter, PC Magazine, 2 Oct. 2025
See All Example Sentences for username
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Jay Weaver, Miami Herald, 13 Oct. 2025
Get a password manager Password managers store your usernames, passwords and email addresses and protect them from unauthorized access.
—David McMillin, CNBC, 8 Oct. 2025
The man, known as Tim, shared photos of the chest in a post on Reddit under username u/tenglempls in the r/ThriftStoreHauls subreddit.
—Soo Kim, MSNBC Newsweek, 3 Oct. 2025
Although the company didn’t specify the threat, POP3 can be unencrypted, allowing usernames and passwords to be sent over plain text.
—Senior Reporter, PC Magazine, 2 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 21 Oct. 2025.
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