us·​er·​name | \ ˈyü-zər-ˌnām How to pronounce username (audio) \
variants: or less commonly user name
plural usernames also user names

Definition of username

: a sequence of characters that identifies a user (such as on a computer system, website, or social media platform) Never reuse a username and password combination. While doing so is convenient, if that combination is ever stolen from one service you use … it will expose every service you have that uses it.— Rachel Cericola These e-mail addresses generally look like this: "".— Walter S. Mossberg

called also user ID

Examples of username in a Sentence

Recent Examples on the Web In the clip, the Grammy-winning singer entered her Instagram username into a protester's phone. Chelsey Sanchez, Harper's BAZAAR, "Rihanna Went Incognito at a Protest Against AAPI Hate in New York City," 5 Apr. 2021 The social media account that posted the video has a username that is the first name of Horning’s daughter, court documents show. Washington Post, "Suspect says he went to the Capitol for three reasons: Anarchy, to smoke weed and to intimidate Congress," 2 Mar. 2021 After a victim enters their username and password, the fake site asks for high-quality images of sensitive documents. Dan Patterson, CBS News, "Clever new phishing scam targets unemployed New Yorkers," 17 Mar. 2021 In this type of attack, bad actors obtain hundreds of thousands, millions or even billions of username and password pairs from the dark web or by compromising an organization. Daniel Woods, Forbes, "For Telcos, There’s An Inherent Cybersecurity Risk In Just Doing Business," 10 Mar. 2021 Certain refund brokers require customers to fill out forms providing their Instacart username and password. Los Angeles Times, "Unfair ratings cost some Instacart shoppers hundreds a week. Here’s what’s happening," 21 Dec. 2020 Kottmann said that her group discovered a Verkada administrator username and password stored on an unencrypted subdomain. CBS News, "U.S. charges 21-year-old Swiss "hacktivist" for security-camera theft and leaks," 19 Mar. 2021 If possible, try to use the same username across platforms. Shama Hyder, Forbes, "7 Things You Can Do To Build An Awesome Personal Brand In 2021," 2 Mar. 2021 According to the affidavit, the users on the emergency alert group account shared the same username and password, which cybersecurity experts said left the system vulnerable to a breach that could be difficult to trace. New York Times, "A State Scientist Questioned Florida’s Virus Data. Now Her Home’s Been Raided.," 11 Dec. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'username.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of username

1971, in the meaning defined above

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Time Traveler for username

Time Traveler

The first known use of username was in 1971

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Last Updated

26 Apr 2021

Cite this Entry

“Username.” Dictionary, Merriam-Webster, Accessed 9 May. 2021.

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Nglish: Translation of username for Spanish Speakers

Britannica English: Translation of username for Arabic Speakers

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