authenticate

[aw-then-ti-keyt]
verb (used with object), authenticated, authenticating.
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:
1565–75; < Medieval Latin authenticātus made authentic (past participle of authenticāre). See authentic, -ate1

authenticatable, adjective
authentication, noun
nonauthenticated, adjective
nonauthentication, noun
reauthenticate, verb (used with object), reauthenticated, reauthenticating.
reauthentication, noun
self-authenticating, adjective
unauthenticated, adjective
well-authenticated, adjective


1. confirm, validate, substantiate.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
authenticate (ɔːˈθɛntɪˌkeɪt)
 
vb
1.  to establish as genuine or valid
2.  to give authority or legal validity to
 
authenti'cation
 
n
 
au'thenticator
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

authenticate
1650s, "verify, establish the credibility of," from M.L. authenticatus, pp. of authenticare, from authenticus (see authentic). Authentication (1788).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Emphasis on may, since no one from the art world's formidable establishment
  will authenticate the painting.
Science has long been used to help authenticate works of art.
To authenticate a message, the sending node computes a sum using a secret key.
When a smart phone reads the code, it is instructed to download the app and
  authenticate with that vehicle only.
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