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

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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

The company authenticates goods and then resells them on its website. Shwanika Narayan,, "The RealReal surges in IPO on Nasdaq, marking e-commerce comeback for CEO," 28 June 2019 Poshmark automatically authenticates items priced at or above $500. Suzanne Kapner, WSJ, "RealReal’s Biggest Hurdle Will Be Keeping It Real After IPO," 25 June 2019 Then, the site does all the work for you: authenticating, photographing, pricing, and listing your items to sell online. Lauren Alexis Fisher, Harper's BAZAAR, "The Best Online Consignment Sites To Score Vintage Designer Fashion," 13 June 2019 Like similar products from Facebook and Google, Apple’s login tool will authenticate you into various apps made by third-party developers. Casey Newton, The Verge, "With an antitrust case looming, Apple’s new login tool is tempting fate," 5 June 2019 The photographs, which showed large fragments of what appeared to be an aircraft, could not be independently authenticated., "Donald Trump calls off retaliatory missile strike on Iran," 21 June 2019 When the family agreed to donate it, Mr. Lowe and Mr. Hunt flew to San Francisco to authenticate it. Peter Baker, New York Times, "A New Lincoln Bible, From a Mantel to a Presidential Library," 19 June 2019 Taylor received a beer shower after the game and got the home run ball late Tuesday after it was authenticated. Susan Slusser,, "A’s belt six homers, top Orioles 16-2 to move two games over .500," 18 June 2019 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

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.

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First Known Use of authenticate

1613, in the meaning defined above

History and Etymology for authenticate

see authentic

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Statistics for authenticate

Last Updated

11 Jul 2019

Look-up Popularity

Time Traveler for authenticate

The first known use of authenticate was in 1613

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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

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Comments on authenticate

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