username

American  

[yoo-zer-neym] / ˈju zərˌneɪm /

noun

Computers.

usernames plural

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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Other Word Forms

Noun Inflected Forms

• usernames
  plural

Etymology

Origin of username

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

Example Sentences

Carter, of Carlisle, confirmed the sender's profile was his and, in court, he admitted breaching notification requirements by failing to promptly disclose the username, which was part of his strict order requirements.

From BBC • May 8, 2026

That day, a Polymarket account with username “Hoaqin” made nearly $14,000 in profit by betting that Paris temperatures would peak at 21 degrees Celsius, Polymarket data shows.

From The Wall Street Journal • Apr. 23, 2026

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

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

“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