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

Media Matters also found multiple references to Veo 3 across the clips, with some using it within the captions or hashtags, while others included Veo in the account's username. —PC Magazine, 3 July 2025

The heartbreaking clip shared on Wednesday under the username @moon_ruberta, shows Navi hiding at the back of her kennel, eyes wide-open, backing away from the volunteer trying to befriend her. —Maria Azzurra Volpe, MSNBC Newsweek, 1 July 2025

The vacation posts come a day after Justin changed his Instagram username to @lilbieber – and shared twelve posts in one day. —Madison E. Goldberg, People.com, 28 June 2025

Credential stuffing becomes much easier when attackers have access to such a vast pool of usernames and passwords. —Kurt Knutsson, FOXNews.com, 25 June 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