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 trader has since deleted their Polymarket username, meaning they now show up as an unlabeled anonymous account.

From The Wall Street Journal • Apr. 23, 2026

Shortly afterwards, the account changed its username and has not placed any bets since.

From BBC • Apr. 19, 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

He went to the computer but realized it needed a log-on username and password.

From "City Spies" by James Ponti