The Free On-line Dictionary of Computing (30 December 2018):

address resolution

    Conversion of an Internet address into the
   corresponding physical address (Ethernet address).  This is
   usually done using Address Resolution Protocol.

   The resolver is a library routine and a set of processes
   which converts hostnames into Internet addresses, though
   this process in not usually referred to as resolution.  See
   DNS.

   (1996-04-09)