noun
corroboration
kuh-rah-buh-RAY-shun/kəˌrɑːbəˈreɪʃn/
Evidence or support that confirms a claim or account.
The matching details in two independent sketches provide corroboration.

Etymology
Built on robur, “strength,” with com- perhaps meaning “thoroughly,” corroboration originally named an act of strengthening or support. It came to mean confirmation: evidence gives strength to a claim rather than to a body or object.
In context
we should have evidence to support the way in which claims are made and that is more or less what corroboration is
More examples
- The receipt provided corroboration of the purchase.
- Investigators found no corroboration for the rumor.
- Her diary offered useful corroboration of the dates.
Forms
corroboration
corroborate verb — support with independent evidence
Similar words
- confirmation
- Confirmation establishes or verifies something; corroboration adds independent supporting evidence.
- evidence
- Evidence is information bearing on a claim; corroboration specifically supports evidence or testimony already offered.