verification

/ˌvɛrɪfɪˈkeɪʃən/
noun
  1. The process of checking or proving that something is true, correct, or real.
    • The verification of the experiment's results took several weeks.
    • We sent the documents for verification to the main office.
    • The bank requires verification of your identity before opening an account.
  2. A statement or piece of evidence that confirms the truth of something.
    • The witness's testimony provided verification of the suspect's alibi.
    • Her signature on the form served as verification of her agreement.
    • We received official verification that the payment had been processed.
Antonyms