identifier

noun

iden·​ti·​fi·​er ī-ˈden-tə-ˌfī(-ə)r How to pronounce identifier (audio)
ə-
: one that identifies

Examples of identifier in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Some services scan the dark web, data broker sites and people-search sites for Social Security numbers, addresses, driver's license numbers and other identifiers. Kurt Knutsson, FOXNews.com, 30 May 2026 Being metal-poor is one of the identifiers the scientists used to figure out which stars formed in the same dwarf galaxy. Julian Dossett, Space.com, 27 May 2026 Instead of starting with a card token, the transaction may begin with an alias, such as a mobile number, a name or another identifier mapped to an account number. Muhammad Azeem, Forbes.com, 26 May 2026 Materials must carry verifiable physical identifiers that are tamper-resistant and can be independently analyzed. Jennifer Bringle, Footwear News, 26 May 2026 See All Example Sentences for identifier

Word History

First Known Use

1807, in the meaning defined above

Time Traveler
The first known use of identifier was in 1807

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Cite this Entry

“Identifier.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/identifier. Accessed 6 Jun. 2026.

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