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
These e-mail addresses generally look like this: "username@location.xxx".—Walter S. Mossberg
called also user ID
Cite this Entry
“Username.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/username. Accessed 10 Aug. 2026.
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