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.

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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

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Etymology

Origin of username

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

Example Sentences

The agent determined that the host computer had software with the username “astro99999” and an IP address linked to McClain’s home address in Menifee.

From Los Angeles Times • Mar. 19, 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

However, the account is based in Nigeria and its username has changed 11 times since 2010, according to X.

From BBC • Nov. 24, 2025

“I’m on the online stuff,” Radar said, “but her username hasn’t logged on to Omnictionary since she left.”

From "Paper Towns" by John Green