The Collaborative International Dictionary of English v.0.48:

Verification \Ver`i*fi*ca"tion\, n. [Cf. F. v['e]rification.]
   1. The act of verifying, or the state of being verified;
      confirmation; authentication.
      [1913 Webster]

   2. (Law)
      (a) Confirmation by evidence.
      (b) A formal phrase used in concluding a plea.
          [1913 Webster]

   Verification of an equation (Math.), the operation of
      testing the equation of a problem, to see whether it
      expresses truly the conditions of the problem. --Davies &
      Peck. (Math. Dict.)
      [1913 Webster]

WordNet (r) 3.0 (2006):

verification
    n 1: additional proof that something that was believed (some
         fact or hypothesis or theory) is correct; "fossils provided
         further confirmation of the evolutionary theory" [syn:
         confirmation, verification, check, substantiation]
    2: (law) an affidavit attached to a statement confirming the
       truth of that statement

Moby Thesaurus II by Grady Ward, 1.0:

61 Moby Thesaurus words for "verification":
   acid test, affirmation, ascertainment, assay, assurance,
   attestation, authentication, backing, backing up, bearing out,
   blank determination, bolstering, brouillon, buttressing,
   certification, check, checking, circumstantiation, collation,
   comparative scrutiny, confirmation, corroboration,
   corroboratory evidence, criterion, cross-check, crucial test,
   crucible, determination, docimasy, documentation, ensuring, essay,
   establishment, feeling out, first draft, fortification, kiteflying,
   ordeal, probation, proof, proving, proving out, ratification,
   reassurance, reassurement, reinforcement, rough draft,
   rough sketch, sounding out, standard, strengthening,
   substantiation, support, supporting evidence, test, test case,
   touchstone, trial, try, undergirding, validation



The Free On-line Dictionary of Computing (30 December 2018):

verification

   The process of determining whether or not the products of a
   given phase in the life-cycle fulfil a set of established
   requirements.


Bouvier's Law Dictionary, Revised 6th Ed (1856):

VERIFICATION, pleading. Whenever new matter is introduced on either side,
the plea must conclude with a verification or averment, in order that the
other party may have an opportunity of answering it. Carth. 337; 1 Lutw.
201; 2 Wils. 66; Dougl. 60; 2 T. R. 576; 1 Saund, 103, n. 1;  Com. Dig.
Pleader, E.
     2. The usual verification of a plea containing matter of fact, is in
these words, "And this he is ready to verify," &c. See 1 Chit. Pl. 537, 616;
Lawes, Civ. Pl. 144; 1 Saund, 103, n. 1; Willes, R. 5; 3 Bl. Com. 309.
     3. In one instance however, new matter need not conclude with a
verification and then the pleader may pray judgment without it; for example,
when the matter pleaded is merely negative. Willes, R. 5; Lawes on Pl. 145.
The reason of it is evident, a negative requires no proof; and it would
therefore be impertinent or nugatory for the pleader, who pleads a negative
matter, to declare his readiness to prove it.



Bouvier's Law Dictionary, Revised 6th Ed (1856):

VERIFICATION, practice. The examination of the truth of a writing; the
certificate that the writing is true. Vide Authentication.