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2 definitions found
 for Main memory
From The Collaborative International Dictionary of English v.0.48 :

  main memory \main memory\ n. (Computers)
     The memory in a computer that holds programs and data for
     rapid access during execution of a program; it usually hold
     the largest quantity of rapid-access storage in a computer;
     RAM+({random+access+memory">-- also called RAM ({random access memory. It is
     contrasted to ROM, disk data storage, cache,
     registers and other forms of data storage.

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

  main memory
  main store
  primary storage
      The storage device used by a
     computer to hold the currently executing program and its
     working data.  A modern computer's main memory is built from
     random-access memory integrated circuits.  In the old days
     ferrite core memory was one popular form of main memory,
     leading to the use of the term "{core" for main memory.
     Computers have several other sorts of memory, distinguished by
     their access time, storage capicity, cost, and the typical
     lifetime or rate of change of the data they hold.  Registers
     in the CPU are fast, few, expensive and typically change
     every few machine instructions.  Other kinds are cache,
     PROM, magnetic disk (which may be used for virtual
     memory) and magnetic tape.

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