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
Change the admin username and password to something strong and unique.
—Kurt Knutsson, FOXNews.com, 13 June 2025
Or your router label may provide a router login website with a username and password instead of an IP address.
—Kara McGinley, USA Today, 11 June 2025
Each breach includes sensitive personal information such as credit and debit card numbers, home addresses and account usernames and passwords from hundreds of thousands – and sometimes millions – of people.
—Thomas Holt, The Conversation, 5 June 2025
The event’s website published a leaderboard of who owned the most $TRUMP coin, but with usernames instead of real names.
—David Ingram, NBC news, 23 May 2025
See All Example Sentences for username
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Kurt Knutsson, FOXNews.com, 13 June 2025
Or your router label may provide a router login website with a username and password instead of an IP address.
—Kara McGinley, USA Today, 11 June 2025
Each breach includes sensitive personal information such as credit and debit card numbers, home addresses and account usernames and passwords from hundreds of thousands – and sometimes millions – of people.
—Thomas Holt, The Conversation, 5 June 2025
The event’s website published a leaderboard of who owned the most $TRUMP coin, but with usernames instead of real names.
—David Ingram, NBC news, 23 May 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 19 Jun. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share