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 username is also linked to a Reddit account. —Chad De Guzman, Time, 25 Sep. 2025

They are designed to trick you into typing your username and password into a fake form. —Kurt Knutsson, FOXNews.com, 23 Sep. 2025

Jubair and others allegedly stole 18 megabytes of data including thousands of names of Court employees, job titles, work locations, and usernames, and cellphone numbers. —Amanda Gerut, Fortune, 20 Sep. 2025

TikTok user Cassi, who posts under the username @cassiolsen, is the owner of golden retriever puppy Lottie, who—like most puppies—appears full of boundless energy. —Rachael O'Connor, MSNBC Newsweek, 19 Sep. 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