verb (used with object), verified, verifying.
to prove the truth of, as by evidence or testimony; confirm; substantiate: Events verified his prediction.
to ascertain the truth or correctness of, as by examination, research, or comparison: to verify a spelling.
to act as ultimate proof or evidence of; serve to confirm.
to prove or confirm (an allegation).
to state to be true, especially in legal use, formally or upon oath.

1275–1325; Middle English verifien < Middle French verifier < Medieval Latin vērificāre, equivalent to vēri-, combining form of vērus true + -ficāre -fy

verifiability, verifiableness, noun
verifiable, adjective
verifier, noun
nonverifiable, adjective
preverify, verb (used with object), preverified, preverifying.
reverify, verb (used with object), reverified, reverifying.
unverifiability, noun
unverifiable, adjective

2. authenticate, validate. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
verify (ˈvɛrɪˌfaɪ)
vb , -fies, -fying, -fied
1.  to prove to be true; confirm; substantiate
2.  to check or determine the correctness or truth of by investigation, reference, etc
3.  law to add a verification to (a pleading); substantiate or confirm (an oath)
[C14: from Old French verifier, from Medieval Latin vērificāre, from Latin vērus true + facere to make]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 14c., from O.Fr. verifier, from M.L. verificare "make true," from L. verus "true" (see very) + root of facere "to make" (see factitious).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Verifying the note's authenticity needn't give you any more information than is
  contained on the note itself.
They have few means of verifying what is offered by the traveler, who as a
  consequence is a kind of trustee of his truth.
The problem for newspapers is that verifying the truth isn't their comparative
Using the same data obtained, he wrote two papers, one verifying that the
  mainstream theory is verified.
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