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

Each message routes victims to a fake Microsoft 365 login page built to harvest usernames and passwords. —Kurt Knutsson, FOXNews.com, 26 Nov. 2025

The heartbreaking clip shared on TikTok earlier in November under the username @mythologicaldogs, shows the puppy napping in his first ever bed, enjoying every minute of his new life full of love and support. —Maria Azzurra Volpe, MSNBC Newsweek, 25 Nov. 2025

Change any usernames or passwords to other personal or business accounts similar to those used for CodeRED profiles. —Kristi Miller, Twin Cities, 25 Nov. 2025

That includes sharing a name, username, and a profile picture. —PC Magazine, 14 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