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

Investigators were particularly interested in people who communicated with Lyons through Omegle, Discord or other online messaging or video chat platforms, or who recalled communicating with someone using the username animus517. — Darrell Smith, Sacbee.com, 5 Oct. 2026

Criminals take usernames and passwords obtained from previous breaches and try the same combinations on other services. — Kurt Knutsson, FOXNews.com, 2 Oct. 2026

Save emails, text messages, phone numbers, screenshots, receipts, transaction records, cryptocurrency wallet addresses, websites, usernames and correspondence. — Angela Ramos, The Conversation, 29 Sep. 2026

The agents also allegedly impersonated a moderator on the wiki, using an identical Cyrillic е character in the admin's username instead of the Latin one. — Will McCurdy, PC Magazine, 6 Sep. 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