Synonyms of 'verification'
There is no independent verification of this story.
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He took her resignation as confirmation of their suspicions.
There were no witnesses to establish corroboration of his version of the accident.
Proof is a fact, argument, or piece of evidence which shows that something is definitely true or definitely exists.
You must have proof of residence in the state.
Thesaurus for verification from the Collins English Thesaurus
establishment of the correctness of a theory, fact , etc