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: "[e-mail]".

—Walter S. Mossberg

called also user ID

Examples of username in a Sentence

Recent Examples on the Web

As Thursday’s post went on to explain: In the case of this attack, the bad actors have entered the correct username and password and requested cross-device sign-in. —Dan Goodin, ArsTechnica, 18 July 2025

Sign-in with Ethereum, for instance, offers a new approach to authentication, eliminating the need for usernames, passwords or reset links. —Wesley Crook, Forbes.com, 17 July 2025

In lieu of a caption, Warren simply tagged Drake’s username. —Hannah Dailey, Billboard, 15 July 2025

That includes usernames, passwords, wallet keys and any two-factor authentication setups. —Steve Hruby, The Enquirer, 15 July 2025

Word History

First Known Use

1971, in the meaning defined above

Rhymes for username

• aspartame
• counterclaim
• overcame
• underframe
• acclaim
• aflame
• airframe
• ballgame
• became
• declaim
• defame
• disclaim

Kids Definition

username

noun

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

called also user ID