DNS server with all the records for a given domain. (Note that the authorization may not have been granted or delegated to the DNS server.)
DNS data that is served by the resident DNS server. The server can be either primary or secondary. This is the DNS data that belongs to a resident domain and is managed by the administrator of that domain, or it is the DNS data that is imported through a zone transfer.
(Context: DNS) A term applied to the DNS server that is the source for data for a specific domain. An authoritative server is the one that the rest of the world comes to query for a specific domain. Men&Mice