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 \ ə-​ˈthen-​ti-​ˌkā-​tər How to pronounce authenticator (audio) , ȯ-​ \ 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 Four of the five do not authenticate your identity with each use. Jessica Guynn, USA TODAY, "Trying to get pregnant using a menstrual tracker app? This is what happens to your health data," 23 Jan. 2020 Gallery Actions owner Vikki Vines says that all of the items have been authenticated, so buyers can be sure there are no counterfeits among the inventory. Diane Cowen, Houston Chronicle, "Fashion alert: 250 luxury vintage handbags to be auctioned," 20 Jan. 2020 While the wording is corroborated by other documents and Quartz’s phone calls to, the documents themselves have not been independently authenticated. Hanna Kozlowska, Quartz, "The scare tactics used to sell overpriced silver to older conservatives," 19 Nov. 2019 All three items were auctioned off by Darren Julien, CEO of Julien's Auctions, which authenticates celebrity memorabilia before selling it. Chauncey Alcorn, CNN, "Kobe Bryant memorabilia is selling for up to $3 million on eBay," 30 Jan. 2020 Ed Jeske, who was stationed in Helmand province in Afghanistan, had a flag and a letter authenticating his service. Cathy Kozlowicz, Milwaukee Journal Sentinel, "Despite a fire destroying their home, a Lisbon family has managed to see 'the good in the world'," 21 Jan. 2020 Pinning requires that the certificate authenticating a website contain a specific cryptographic hash, even if the certificate offered is otherwise valid. Dan Goodin, Ars Technica, "Critical Windows 10 vulnerability used to Rickroll the NSA and Github," 15 Jan. 2020 Since then, Facebook has taken steps to authenticate advertisers and fend off foreign agents, as well as to institute a fact-checking program designed to weed out fake news and other debunked claims. Washington Post, "Facebook has floated limiting political ads and labeling that they aren’t fact-checked, riling 2020 campaigns," 4 Dec. 2019 But Grosvenor noticed the high quality depictions of a cow and horse seen in the painting, and after removing layers of dirt and varnish, the researchers authenticated the work as a landscape by 17th-century artist Peter Brueghel the Younger. Jason Daley, Smithsonian, "An Unidentified Botticelli Painting Spent Decades Hidden in Welsh Museum’s Storeroom," 18 Nov. 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.

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

Time Traveler for authenticate

Time Traveler

The first known use of authenticate was in 1613

See more words from the same year

Statistics for authenticate

Last Updated

21 Feb 2020

Cite this Entry

“Authenticate.” Dictionary, Merriam-Webster, Accessed 24 Feb. 2020.

Keep scrolling for more

More Definitions for authenticate


How to pronounce authenticate (audio)

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).


See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

More Confusing Words—Quiz

  • cats on impossible timber
  • The magician ______ moved the selected card to the top of the deck.
Spell It

Can you spell these 10 commonly misspelled words?


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!