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
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
The username is also linked to a Reddit account.
—Chad De Guzman, Time, 25 Sep. 2025
See All Example Sentences for username
Examples are automatically compiled from online sources to
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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
The username is also linked to a Reddit account.
—Chad De Guzman, Time, 25 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 13 Oct. 2025.
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