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See more synonyms for authenticate on Thesaurus.com
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.
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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·ing.re·au·then·ti·ca·tion, nounself-au·then·ti·cat·ing, adjectiveun·au·then·ti·cat·ed, adjectivewell-au·then·ti·cat·ed, adjective


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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for unauthenticated

Historical Examples

  • There was an unauthenticated rumour that he had been seen of late, lurking about Wanley.


    George Gissing

  • This, by many, is believed to be a species, but as such is unauthenticated.

  • The whole investigation is a little depressing, and makes one very shy of unauthenticated ballads.

    Old Friends

    Andrew Lang

  • Destroyed as it is by the malign influence of these and the like objections, the universal is unauthenticated.

  • However all this may really have been, there is no question of the genuineness of this unauthenticated narrative.

British Dictionary definitions for unauthenticated


verb (tr)
  1. to establish as genuine or valid
  2. to give authority or legal validity to
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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 unauthenticated



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

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Online Etymology Dictionary, © 2010 Douglas Harper