username

American  

[yoo-zer-neym] / ˈyu zərˌneɪm /

noun

Computers.

1. Also called sign-in name,.  Also called login name,.  Also called sign-on name.  Also called logon name,.  a unique sequence of characters used to identify a user and allow access to a computer system, computer network, or online account.

2. the part of an email address before the @ sign.

---

username British  

/ ˈjuːzəˌneɪm /

noun

1. computing a name that someone uses for identification purposes when logging onto a computer, using chatrooms, or as part of his or her e-mail address

---

Etymology

Origin of username

First recorded in 1970–75; user ¹ ( def. ) + name ( def. )

Example Sentences

Ilyas Lebleu, an A.I. research student based in France who edits Wikipedia under the username Chaotic Enby, first wrote the proposal that was debated and adopted as the site’s A.I. ban.

From Slate • Apr. 1, 2026

Essayli said that on Feb. 20, law enforcement took the victim’s digital devices to try to identify the person behind the username online.

From Los Angeles Times • Feb. 23, 2026

She can be reached on Signal at the username efindell.10.

From The Wall Street Journal • Feb. 9, 2026

“It’s rare we get a non-temp market with so much attention and liquidity like this,” says a 31-year-old New York-based Kalshi trader whose username is NelsonOrAri.

From Barron's • Jan. 26, 2026

Phone Friend was pulled up on my screen— their username was EyesOnTheSky_Traveler—but I hadn’t added them to my friend list yet.

From "Bye Forever, I Guess" by Jodi Meadows