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

Observers were pretty sure the billionaire was leading the pack when the auction’s public leaderboard displayed the username SUN topping the ranks. —Allison Morrow, CNN Money, 22 May 2025

Each record included an ID tag for the type of account, a URL for each website or service, and then usernames and plaintext passwords. —Matt Burgess, Wired News, 22 May 2025

Mariel Lucian, who posts to TikTok under the username @mariellucian, has gone viral after showcasing a snippet of her day with her young dog, sitting under a beautifully blossoming tree. —Rachael O'Connor, MSNBC Newsweek, 21 May 2025

Today, Skinner has 1.3 million followers on Instagram under the username @bennydrama7. —Paulina Prosnitz, Air Mail, 17 May 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