Definitions for "Cross-certification"
A condition in which two or more different certificate issuing authorities trust among themselves by issuing certificates having the other as the subject of the certificate.
A status where two or more organizations or certificate authorities share some level of trust.
A certificate issued by one certification authority to a second certification authority so that users of the first certification authority are able to obtain the public key of the second certification authority and verify the certificates it has created. Often cross certification refers specifically to certificates issued to each other by two CAs at the same level in a hierarchy.