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

My username is also randomly generated, so there’s no association with any of my PII. —Evan Zimmer, CNBC, 9 Dec. 2025

The heartwarming clip shared in November under the username @laurenandcody shows the golden retriever, Charlie, jumping around, wagging his tail, and burying his head in the snow, after his owner took him out to enjoy the first snowfall of the year. —Maria Azzurra Volpe, MSNBC Newsweek, 6 Dec. 2025

Signup requires only a ZIP+4 code, a username, and payment. —Aamir Khollam, Interesting Engineering, 4 Dec. 2025

Obviously, don’t recycle usernames across platforms. —Jp Aumasson, Wired News, 29 Nov. 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