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 for canonical name
From The Free On-line Dictionary of Computing (30 December 2018) :

  canonical name
     (CNAME) A host's official name as opposed to an alias.  The
     official name is the first hostname listed for its Internet
     address in the hostname database, /etc/hosts or the
     Network Information Service (NIS) map hosts.byaddr ("hosts"
     for short).  A host with multiple network interfaces may have
     more than one Internet address, each with its own canonical
     name (and zero or more aliases).
     You can find a host's canonical name using nslookup if you
     	set querytype=CNAME
     and then type a hostname.

Contact=webmaster@dict.org Specification=RFC 2229