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

  fully qualified domain name
  domain name
      (FQDN) The full name of a system, consisting of
     its local hostname and its domain name, including a
     top-level domain (tld).  For example, "venera" is a hostname
     and "venera.isi.edu" is an FQDN.  An FQDN should be sufficient
     to determine a unique Internet address for any host on the
     Internet.  This process, called "name resolution", uses the
     Domain Name System (DNS).
     With the explosion of interest in the Internet following the
     advent of the web, domain names (especially the
     most significant two components, e.g. "sun.com", and
     especially in the ".com" tld) have become a valuable part of
     many companies' "brand".  The allocation of these, overseen by
     ICANN, has therefore become highly political and is
     performed by a number of different registrars.  There are
     different registries for the different tlds.
     A final dot on the end of a FQDN can be used to tell the DNS
     that the name is fully qualified and so needs no extra
     suffixes added, but it is not required.
     See also network, the, network address.

Contact=webmaster@dict.org Specification=RFC 2229