Verification is an extra or final bit of proof that establishes something is true.

To verify something is to make sure it's correct or true, so verification is an action that establishes the truth of something. Checking an ID is a verification of your age. Your bank will often ask for part of your social security number as verification of your identity. Scientists do research to establish verification for their theories. In all cases, verification is like a stamp of approval.

Definitions of verification
  1. noun
    additional proof that something that was believed (some fact or hypothesis or theory) is correct
    synonyms: check, confirmation, substantiation
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    bed check
    a check that everyone is in bed by the time they should be
    an instance of confirming something by considering information from several sources
    odd-even check, parity check, redundancy check
    a system of checking for errors in computer functioning
    a digit representing the sum of the digits in an instance of digital data; used to check whether errors have occurred in transmission or storage
    type of:
    cogent evidence, proof
    any factual evidence that helps to establish the truth of something
  2. noun
    (law) an affidavit attached to a statement confirming the truth of that statement
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    type of:
    written declaration made under oath; a written statement sworn to be true before someone legally authorized to administer an oath
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