au·​then·​ti·​cate | \ ə-ˈthen-ti-ˌkāt How to pronounce authenticate (audio) , ȯ-\
authenticated; authenticating

Definition of authenticate

transitive verb

: to prove or serve to prove to be real, true, or genuine authenticate a document

Keep scrolling for more

Other Words from authenticate

authenticator \ -​ˈthen-​ti-​ˌkā-​tər How to pronounce authenticator (audio) \ noun

Choose the Right Synonym for authenticate

confirm, corroborate, substantiate, verify, authenticate, validate mean to attest to the truth or validity of something. confirm implies the removing of doubts by an authoritative statement or indisputable fact. confirmed the reports corroborate suggests the strengthening of what is already partly established. witnesses corroborated his story substantiate implies the offering of evidence that sustains the contention. the claims have yet to be substantiated verify implies the establishing of correspondence of actual facts or details with those proposed or guessed at. all statements of fact in the article have been verified authenticate implies establishing genuineness by adducing legal or official documents or expert opinion. handwriting experts authenticated the diaries validate implies establishing validity by authoritative affirmation or by factual proof. validated the hypothesis by experiments

Examples of authenticate in a Sentence

The signature has been authenticated. a jeweler authenticated the diamond as real

Recent Examples on the Web

Once the Muraena authenticates the session’s cookie, it is then passed along to NecroBrowser, which can create windows to keep track of the private accounts of tens of thousands of victims. Alyssa Newcomb, Fortune, "Hackers Can Now Bypass Two-Factor Authentication With a New Kind of Phishing Scam," 4 June 2019 Then, users must authenticate their identities in three separate ways. Makena Kelly, The Verge, "Nearly 150 West Virginians voted with a mobile blockchain app," 10 Nov. 2018 But from the start, Oribe showed its commitment to not only entering the category but truly doing right by it and its consumers by tapping an actual black woman, celebrity hairstylist and beauty expert Stacey Ciceron, to authenticate the collection. Tanisha Pina, Glamour, "Oribe Is Launching Its First-Ever Line for Natural Hair," 19 Mar. 2019 The second major flaw is that although both coordinates of the public keys are sent during the second phase of the pairing, the protocol authenticates only the x-coordinate. Dan Goodin, Ars Technica, "Decade-old Bluetooth flaw lets hackers steal data passing between devices," 26 July 2018 Thankfully, experts are already thinking about new ways to authenticate digital pictures. James Vincent, The Verge, "These faces show how far AI image generation has advanced in just four years," 17 Dec. 2018 When Carlson had the item authenticated by NASA, the space agency kept the bag, claiming rightful ownership of it. Robert Mccoppin,, "Legal fight over 'unprecedented' amount of moon dust follows path of Chicago-area collector who sold hers for $1.8 million," 15 June 2018 The cash, found in 26 different currencies, was authenticated and counted by 22 bank officers, Amar Singh, head of the Commercial Crime Investigation Department, said in a televised press conference Friday. Laignee Barron, Time, "Cash Found in Bags During a Raid on Property Linked to Malaysia's Former Prime Minister Totals $29 Million," 28 June 2017 What is your timeframe for signing (i.e., authenticating) calls originating on your network? Jon Brodkin, Ars Technica, "Ajit Pai slams Sprint, Charter, and CenturyLink for poor robocall effort," 6 Nov. 2018

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

See More

First Known Use of authenticate

1613, in the meaning defined above

History and Etymology for authenticate

see authentic

Keep scrolling for more

Learn More about authenticate

Statistics for authenticate

Last Updated

13 Jun 2019

Look-up Popularity

Time Traveler for authenticate

The first known use of authenticate was in 1613

See more words from the same year

Keep scrolling for more

More Definitions for authenticate



English Language Learners Definition of authenticate

: to prove that something is real, true, or genuine : to prove that something is authentic


au·​then·​ti·​cate | \ ə-ˈthen-ti-ˌkāt How to pronounce authenticate (audio) \
authenticated; authenticating

Kids Definition of authenticate

: to prove or serve as proof that something is authentic


transitive verb
authenticated; authenticating

Legal Definition of authenticate

1 : to prove or serve to prove that (something) is genuine especially : to prove that (an item of evidence) is genuine for the purpose of establishing admissibility
2 : to make (a written instrument) valid and effective by marking especially with one's signature authenticate a check

Keep scrolling for more

Comments on authenticate

What made you want to look up authenticate? Please tell us where you read or heard it (including the quote, if possible).


standardized text or formulaic language

Get Word of the Day daily email!

Test Your Vocabulary

Finance Words Quiz

  • a-piggy-bank
  • The etymology of mortgage is related most closely to which two words?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!