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

memory management

    A collection of techniques for
   providing sufficient memory to one or more processes in a
   computer system, especially when the system does not have
   enough memory to satisfy all processes' requirements
   simultaneously.  Techniques include swapping, paging and
   virtual memory.  Memory management is usually performed
   mostly by a hardware memory management unit.

   (1995-01-23)