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verb (used with object), au·then·ti·cat·ed, au·then·ti·cat·ing.
  1. to establish as genuine.
  2. to establish the authorship or origin of conclusively or unquestionably, chiefly by the techniques of scholarship: to authenticate a painting.
  3. to make authoritative or valid.

Origin of authenticate

1565–75; < Medieval Latin authenticātus made authentic (past participle of authenticāre). See authentic, -ate1
Related formsau·then·ti·cat·a·ble, adjectiveau·then·ti·ca·tion, nounnon·au·then·ti·cat·ed, adjectivenon·au·then·ti·ca·tion, nounre·au·then·ti·cate, verb (used with object), re·au·then·ti·cat·ed, re·au·then·ti·cat··au·then·ti·ca·tion, nounself-au·then·ti·cat·ing, adjectiveun·au·then·ti·cat·ed, adjectivewell-au·then·ti·cat·ed, adjective

Synonyms for authenticate

See more synonyms for on Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for authenticate


verb (tr)
  1. to establish as genuine or valid
  2. to give authority or legal validity to
Derived Formsauthentication, nounauthenticator, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for authenticate

"verify, establish the credibility of," 1650s, from Medieval Latin authenticatus, past participle of authenticare, from authenticus (see authentic). Related: Authenticated; authenticating.

Online Etymology Dictionary, © 2010 Douglas Harper