certify
Concise Oxford English Dictionary © 2008 Oxford University Press:
certify/ˈsɜːtɪfʌɪ/
▶verb (certifies, certifying, certified) formally attest or confirm.
■ chiefly Brit. officially recognize as possessing certain qualifications or meeting certain standards.
■ officially declare (someone) insane.
– derivatives
certifier noun.
certifier noun.
– origin ME: from OFr. certifier, from late L. certificare, from L. certus ‘certain’.
'certify' also found in these Oxford entries:

