verb
confirm
kun-FURM/kənˈfɜːrm/
To establish something more firmly as valid or settled.
The matching picture confirms that the delivered jug is the one ordered.

Etymology
Firmare supplies the idea of strengthening, with con- perhaps adding emphasis. Making something firm developed into making it certain: confirming a claim establishes its truth through proof or assurance.
In context
be subject to forensic analysis um back at um our office. The parcels are now itemized by Federal Police officers, then transported to their Sydney headquarters for extensive testing to confirm the contents.
More examples
- Please confirm your reservation by Friday.
- Her success confirms my belief that practice pays off.
- The bishop confirms several new church members during the service.
Forms
confirm · confirms · confirmed · confirming
confirmation noun — Evidence or approval that makes something certain.