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

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

She can be reached on Signal at the username JournoLiz.80.

From The Wall Street Journal • Mar. 5, 2026

In January, a Polymarket trader with the username “HD2” bet nearly $100,000 that BlackRock executive Rick Rieder would be nominated as the next Federal Reserve chair.

From Barron's • Feb. 27, 2026

Not a fake identity, not a randomized username, nothing.

From "Warcross" by Marie Lu