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

The @TrevorMayBaseball channel on YouTube boasts more than 159,000 subscribers, while May’s Twitch page by the same username has more than 188,000 followers. —Peter Sblendorio, New York Daily News, 7 Mar. 2026

Second, screenshots can expose usernames, email addresses or other visible details. —Kurt Knutsson, FOXNews.com, 6 Mar. 2026

Logging in to Incogni requires your username and password by default. —Neil J. Rubenking, PC Magazine, 4 Mar. 2026

There are multiple social media accounts on several platforms with a username that matches the gunman's name. —Anna Schecter, CBS News, 3 Mar. 2026

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