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

In a viral TikTok video shared in December under the username @thealtylife, the poster can be seen sitting on the floor in her living room with a big puppy curling up on her lap, enjoying the warmth of his new home. —Paul Du Quenoy, Newsweek, 10 Jan. 2025

The real-time video and data feeds don’t require any usernames or passwords to access. —Matt Burgess, WIRED, 7 Jan. 2025

For example, exposure of your IP address has low impact, while exposure of your username and password has maximal impact. —PCMAG, 7 Jan. 2025

Change your router admin username and password to something unique, save your changes, and you are done. Follow me on Twitter or LinkedIn. —Davey Winder, Forbes, 5 Jan. 2025

Word History

First Known Use

1971, in the meaning defined above

Kids Definition

username

noun

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

called also user ID