to say in a formal or official way, usually in the form of an official document, that something is true or correct:
[ + (that) ] I hereby certify (that) the above information is true and accurate.
[ + noun/adj ] The man was certified (as) dead on arrival at the hospital.
The meat has been certified (as) fit for human consumption.
The driver holds a commercial license and is certified to transport hazardous materials.